Discover and validate defined projects

[ian28223]

What does this PR do?

• Discovers available projects/components and logs them at debug level.
• Logs a warning if projects/components defined in config were not found.

Motivation

• As of current, if an invalid project/component is specified, the integration does not return any metrics and no indication why. Looking in the logs, we get an HTTP error 404
• AGENT-7116

Additional Notes

• List of available components is queried from the API and is logged on debug mode

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] PR title must be written as a CHANGELOG entry (see why)
• [ ] Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• [ ] PR must have changelog/ and integration/ labels attached

[hithwen]

Isn't it a bit overkill to add a config option for this? Shouldn't it always log with self.log.warning? I'm not sure how much visibility self.warning provides tbh

[github-actions[bot]]

The validations job has failed; please review the Files changed tab for possible suggestions to resolve.

[codecov[bot]]

Codecov Report

Merging #11171 (d86020e) into master (ca15693) will decrease coverage by 1.46%. The diff coverage is 91.11%.

:exclamation: Current head d86020e differs from pull request most recent head 7507ad0. Consider uploading reports for the commit 7507ad0 to get more accurate results

Flag	Coverage Δ
arangodb	?
boundary	?
ddev	?
sonarqube	95.78% <91.11%> (+0.09%)	:arrow_up:
teradata	?
traffic_server	?

Flags with carried forward coverage won't be shown. Click here to find out more.

[ian28223]

replaced by #13450