Exclude playground and tests from CodeQL scanning

[joperezr]

Description

Add a .CodeQL.yml configuration file to exclude the playground/ and tests/ directories from CodeQL scanning. These directories contain sample and test code, not product code, so they don't need to be analyzed by CodeQL. This uses the path_classifiers mechanism to mark them as reference code.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire.dev issue:
      • New issue
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 15177

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 15177"

[Copilot]

Pull request overview

Adds a repository-level CodeQL configuration to classify non-product directories as reference code so they’re not included in CodeQL scanning scope, reducing noise from sample and test sources.

Changes:

• Introduces .CodeQL.yml with path_classifiers configuration.
• Marks playground/** and tests/** as refs (reference code) for CodeQL.

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