ci: code-ql

[lonelyicer]

Changed build mode for java-kotlin from autobuild to manual and updated build steps.

[Copilot]

Pull request overview

This PR adds a new CodeQL Advanced workflow for automated security analysis, configuring it to run on push/pull requests to the neoforge/1.21.1 branch and on a weekly schedule. The workflow analyzes both GitHub Actions and Java/Kotlin code, with the java-kotlin language configured to use manual build mode instead of autobuild.

Key Changes

• Added CodeQL workflow with two language analyses: actions (none build mode) and java-kotlin (manual build mode)
• Implemented manual Gradle build steps for Java/Kotlin analysis with chmod and build commands
• Configured workflow to run on push, pull request, and weekly cron schedule

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[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.