MWPW-192158: Shared item loading layer for bulk publish

[Andrei4226]

Resolves https://jira.corp.adobe.com/browse/MWPW-192158
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Extracts the shared item selection UI and data-loading logic from the Translation area into common/, making it reusable across features (Bulk Publish, Translations etc.). Decouples all UI components from Store.translationProjects via a new getItemsSelectionStore() abstraction.
Adds portable data-loading utils, shared rendering helpers and full unit test coverage.

Please review all functionalities from the "Select Items" section in the Translation area.

Please do the steps below before submitting your PR for a code review or QA

• C1. Cover code with Unit Tests
• C2. Add a Nala test (double check with #fishbags if nala test is needed)
• C3. Verify all Checks are green (unit tests, nala tests)
• C4. PR description contains working Test Page link where the feature can be tested
• C5: you are ready to do a demo from Test Page in PR (bonus: write a working demo script that you'll use on Thursday, you can eventually put in your PR)
• C.6 read your Jira one more time to validate that you've addressed all AC's and nothing is missing

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Test URLs:

• Before: https://main--mas--adobecom.aem.live/
• After: https://mwpw-192158--mas--adobecom.aem.live/

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Commits

• 124c2d2 ✅ (latest)
• fad2fc4 ✅
• 4a8ed93 ✅
• c25b633 ✅
• 1285f6f ✅
• b786b32 ✅
• b27aeed ✅
• 3937a89 ✅
• a443cf6 ✅
• 71b55fe ✅
• cd487ca ✅
• a1d1a36 ✅
• 3ef7ffc ✅
• 0da50f8 ✅
• e447922 ✅
• 7d84094 ✅
• e5b2c4e ✅

[codecov]

Codecov Report

❌ Patch coverage is 96.64570% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.56%. Comparing base (617d943) to head (124c2d2).

Files with missing lines	Patch %	Lines
studio/src/common/utils/item-loading.js	96.79%	13 Missing ⚠️
...tudio/src/translation/mas-collapsible-table-row.js	75.00%	9 Missing ⚠️
studio/src/common/items-selection-store.js	77.27%	5 Missing ⚠️
studio/src/common/components/mas-selected-items.js	91.17%	3 Missing ⚠️
...io/src/common/components/mas-select-items-table.js	97.14%	1 Missing ⚠️
studio/src/common/utils/items-loader.js	98.68%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
+ Coverage   87.46%   87.56%   +0.09%     
==========================================
  Files         210      215       +5     
  Lines       63107    63608     +501     
==========================================
+ Hits        55198    55697     +499     
- Misses       7909     7911       +2     

Files with missing lines	Coverage Δ
...io/src/common/components/mas-items-selector.css.js	100.00% <100.00%> (ø)
studio/src/common/components/mas-items-selector.js	95.45% <100.00%> (ø)
...rc/common/components/mas-search-and-filters.css.js	100.00% <ø> (ø)
...io/src/common/components/mas-search-and-filters.js	96.40% <100.00%> (ø)
...rc/common/components/mas-select-items-table.css.js	100.00% <100.00%> (ø)
...io/src/common/components/mas-selected-items.css.js	100.00% <100.00%> (ø)
studio/src/common/styles/table-styles.css.js	100.00% <100.00%> (ø)
studio/src/common/utils/item-loading-browser.js	100.00% <100.00%> (ø)
studio/src/common/utils/render-utils.js	100.00% <100.00%> (ø)
...o/src/translation/mas-collapsible-table-row.css.js	100.00% <100.00%> (ø)
... and 11 more

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