argo_workflows: add container-based config discovery support

[vitkyrka]

What does this PR do?

Adds Kubernetes container-based config discovery support to argo_workflows.

The port is taken from the metrics named container port.

The AD identifier workflow-controller is a generic name that could be used by something even not from Argo, so we use a CEL selector to narrow the image reference further down to something that contains argoproj/workflow-controller.

Motivation

https://datadoghq.atlassian.net/browse/DSCVR-530

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-datadog-prod-us1]

 

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 50.00%
• Overall Coverage: 69.89% (-18.54%)

_{This comment will be updated automatically if new data arrives.
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[vitkyrka]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• argo_workflows: add container-based config discovery support #24512 : 2 dependent PRs (#24510 , #24511 ) 👈 (View in Graphite)
• velero: add container-based config discovery support #24507 : 5 other dependent PRs (#24459 , #24506 , #24519 and 2 others)
• Add discovery port name helper #24555
• master

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[dd-octo-sts]

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