fix(ci): run CodeQL on pushes

[Seddryck]

Summary

• add an advanced CodeQL workflow for C#
• run analysis on every push, pull requests targeting main, a weekly schedule, and manual dispatch
• grant only the permissions needed to upload code-scanning results

Root cause

The repository did not contain a CodeQL workflow, so pushes had nothing to trigger.

Validation

• parsed .github/workflows/codeql.yml and verified its triggers and CodeQL actions
• dotnet build src/Expressif.LanguageServer/Expressif.LanguageServer.csproj --configuration Release --framework net10.0 --runtime win-x64 --no-restore --nologo
• git diff --cached --check

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f2be75a8-9b6a-4676-a423-66902f17a65e

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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.