Add CodeQL workflow for code analysis

[MrJustinB]

trying to resolve Continuous SDL warning saying we do not have CodeQL setup in this repo

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[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.

[Copilot]

Pull request overview

Adds a GitHub Actions CodeQL workflow to enable code scanning for the repository and address the Continuous SDL warning about missing CodeQL setup.

Changes:

• Introduces a new .github/workflows/codeql.yml workflow for CodeQL “advanced” scanning.
• Configures a language matrix to analyze Actions, C#, JavaScript/TypeScript, and Python.
• Schedules periodic scans and runs analysis on pushes/PRs for selected branches.

[jsquire]

Not sure if this is running in CI just because it's the subject of this PR or no - but there's no way that we should be doing a full scan (90+ minutes) on every PR... Probably want some EngSys eyes on this sucker too.

//cc: @raych1, @benbp

[jsquire]

There's no way we should be adding this on every PR at 90+ minutes. We'd need to very specifically scope this to only the files changed in a PR.

[raych1]

Not sure if this is running in CI just because it's the subject of this PR or no - but there's no way that we should be doing a full scan (90+ minutes) on every PR... Probably want some EngSys eyes on this sucker too.

//cc: @raych1, @benbp

@jsquire This is the place where codeQl is enabled in the main build job:

azure-sdk-for-net/eng/pipelines/templates/jobs/ci.yml

Line 139 in f4c0ee3

codeql:

@MrJustinB codeQL is already enabled for 'azure-sdk-for-net' repo and we don't need this change.
However, I do see an S360 alerts about missing python code check for this repo at here. Let me create a separate PR to solve it.