ci: split CodeQL into separate PR and push/schedule jobsuser/jvalesmena/codeql-sharding

The previous single-job approach with a 4-shard matrix caused PRs to
spin up 4 identical runners all building the same changed files.

Split into two jobs:
- analyze-pr: runs only on pull_request, single runner, builds changed
  samples via Build-ChangedSamples.ps1. No shard matrix overhead.
- analyze: runs on push/schedule, 4-shard matrix, each shard builds its
  slice of all samples. Also drops the now-unnecessary 'get-changed-files'
  step from the push path.

Co-authored-by: Copilot <[email protected]>

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