CDS extractor should respect `paths-ignore` from CodeQL config

[data-douser]

Problem

The CodeQL CDS extractor does not respect the paths-ignore configuration from the user's CodeQL config file (.github/codeql/codeql-config.yml). When a user configures paths-ignore to exclude certain directories or file patterns from analysis, the JavaScript extractor already honors this via LGTM_INDEX_FILTERS, but the CDS extractor independently discovers and compiles CDS files without consulting the config — resulting in ignored directories still being compiled and extracted.

Expected Behavior

When a paths-ignore list is present in the CodeQL configuration file, the CDS extractor should:

1. Skip CDS projects whose directory matches a paths-ignore pattern
2. Filter out individual CDS files that match a paths-ignore pattern before compilation
3. Propagate the patterns to the JavaScript extractor (via LGTM_INDEX_FILTERS) so compiled .cds.json output files in ignored directories are also excluded from extraction

References

• CodeQL paths-ignore documentation
• The JavaScript extractor already supports this via the LGTM_INDEX_FILTERS environment variable, which the CodeQL CLI populates from the config file