ci: Migrates some GH workflows to reusable actions (#23178)

Migrates some GH workflows to reusable actions.

follow-up PR of these:
- MetaMask/github-tools#169
- MetaMask/github-tools#168

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## **Description**

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CHANGELOG entry:

## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.



<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Migrates CI workflows from reusable workflows to explicit action steps
and adds manual dispatch triggers where applicable.
> 
> - **Workflows**:
>   - **`check-pr-max-lines.yml`**:
> - Replace reusable workflow with action
`MetaMask/github-tools/.github/actions/pr-line-check@v1`.
> - Add `runs-on: ubuntu-latest`; configure `max-lines` and
`ignore-patterns`.
>   - **`flaky-test-report.yml`**:
> - Replace reusable workflow with action `.../flaky-test-report@v1`.
> - Add `workflow_dispatch`; set `runs-on`; pass `repository`,
`workflow-id`, `github-token`, and Slack webhook.
>   - **`post-merge-validation.yml`**:
> - Replace reusable workflow with action
`.../post-merge-validation@v1`.
> - Add `workflow_dispatch`; set `runs-on`; pass `repo`,
`start-hour-utc`, `github-token`, and GCP creds.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
dc5e870. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Maarten Zuidhoorn <[email protected]>

Author: jvbriones

.github/workflows/check-pr-max-lines.yml

@@ -1,16 +1,19 @@
-name: "Check PR Max Lines"
+name: 'Check PR Max Lines'
 
 on:
   pull_request:
     types: [opened, reopened, synchronize]
 
 permissions:
   contents: read
-  pull-requests: write  # Required for the called workflow to manage labels
+  pull-requests: write # Required for the called workflow to manage labels
 
 jobs:
   check-pr-max-lines:
-    uses: metamask/github-tools/.github/workflows/pr-line-check.yml@main
-    with:
-      max_lines: 1000
-      ignore_patterns: '(\.lock|\.snap)$'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check PR lines changed
+        uses: MetaMask/github-tools/.github/actions/pr-line-check@v1
+        with:
+          max-lines: '1000'
+          ignore-patterns: '(\.lock|\.snap)$'

.github/workflows/flaky-test-report.yml

@@ -4,17 +4,20 @@ on:
   schedule:
     # Once every day from Monday-Friday at 08:00 UTC
     - cron: 0 8 * * 1-5
+  workflow_dispatch:
 
 permissions:
   contents: read
   actions: read
 
 jobs:
   flaky-test-report:
-    uses: MetaMask/github-tools/.github/workflows/flaky-test-report.yml@main
-    with:
-      repository: ${{ github.event.repository.name }}
-      workflow_id: ci.yml
-    secrets:
-      github-token: ${{ secrets.GITHUB_TOKEN }}
-      slack-webhook-flaky-tests: ${{ secrets.SLACK_WEBHOOK_FLAKY_TESTS }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate flaky test report
+        uses: MetaMask/github-tools/.github/actions/flaky-test-report@v1
+        with:
+          repository: ${{ github.event.repository.name }}
+          workflow-id: ci.yml
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          slack-webhook-flaky-tests: ${{ secrets.SLACK_WEBHOOK_FLAKY_TESTS }}

.github/workflows/post-merge-validation.yml

@@ -1,15 +1,18 @@
 name: Post Merge Validation
 
-on: 
+on:
   schedule:
     - cron: '0 7 * * *'
+  workflow_dispatch:
 
 jobs:
   post-merge-validation-tracker:
-    uses: MetaMask/github-tools/.github/workflows/post-merge-validation.yml@main
-    with:
-      repo: ${{ github.repository }}
-      start_hour_utc: 7
-    secrets:
-      github-token: ${{ secrets.GITHUB_TOKEN }}
-      google-application-creds-base64: ${{ secrets.GCP_RLS_SHEET_ACCOUNT_BASE64 }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run post-merge validation
+        uses: MetaMask/github-tools/.github/actions/post-merge-validation@v1
+        with:
+          repo: ${{ github.repository }}
+          start-hour-utc: '7'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          google-application-creds-base64: ${{ secrets.GCP_RLS_SHEET_ACCOUNT_BASE64 }}