Validate jira ticket reason for manifest declarations in the parser to improve error clarity

[nccatoni]

Motivation

Changes

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

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Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

tests/test_the_test/manifests/manifests_agent_edit/agent.yml            @DataDog/system-tests-core
tests/test_the_test/test_decorators.py                                  @DataDog/system-tests-core
tests/test_the_test/test_easy_win.py                                    @DataDog/system-tests-core
tests/test_the_test/test_manifest.py                                    @DataDog/system-tests-core
utils/_decorators.py                                                    @DataDog/system-tests-core
utils/manifest/__init__.py                                              @DataDog/system-tests-core
utils/manifest/_internal/__init__.py                                    @DataDog/system-tests-core
utils/manifest/_internal/declaration.py                                 @DataDog/system-tests-core

[datadog-prod-us1-3]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 1 job - 0 passed on retry

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 1f0f268 | Docs | Datadog PR Page | Give us feedback!}

[chatgpt-codex-connector]

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