Add Python CEL content bundler and integrate into Konflux build

[Vincent056]

Summary

• Adds utils/cel_bundler.py, a Python port of the Go cel-bundler from the compliance-operator repo, to bundle individual CEL rule and profile YAML files into a single cel-content.yaml for the compliance-operator parser.
• Updates the Konflux Containerfile to run the bundler at build time when build/cel-rules/ and build/cel-profiles/ directories are present, shipping cel-content.yaml alongside the existing XCCDF DataStream XML.
• Adds 18 unit tests covering happy-path loading, field preservation, validation errors (missing fields, duplicates, unknown references), YAML serialization roundtrip, and key ordering.

Test plan

• pytest tests/unit/utils/test_cel_bundler.py — 18 tests pass
• Verify Konflux content image build succeeds with CEL rule/profile directories in build/
• Verify the generated cel-content.yaml is consumable by the compliance-operator parser

[Vincent056]

/retest

[Vincent056]

let's deprecate this one in favor of #14597