[Dashboard CRD] Use fully-qualified domain name finalizer

[tbavelier]

What does this PR do?

• Cherry-pick of [CECO-1441] Use fully-qualified domain name finalizer #1397

Motivation

• Refer to main PR

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.40%. Comparing base (c9cc04d) to head (6f6bfc9).

Additional details and impacted files

@@           Coverage Diff           @@
##             v1.9    #1398   +/-   ##
=======================================
  Coverage   47.40%   47.40%           
=======================================
  Files         223      223           
  Lines       19244    19244           
=======================================
  Hits         9123     9123           
  Misses       9635     9635           
  Partials      486      486           

Flag	Coverage Δ
unittests	47.40% <ø> (ø)

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

Files with missing lines	Coverage Δ
internal/controller/datadogdashboard/finalizer.go	61.53% <ø> (ø)

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[tbavelier]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in v1.9 is 16m.

Use /merge -c to cancel this operation!

[dd-devflow]

🚨 MergeQueue: This merge request is in error

mergequeue build completed successfully, but the github api returned an error while merging the pr.
It's probably because:

• repository configuration requires approval by code owners, but no code owner approved this PR
• target branch of PR is restricted to only allow up-to-date branches, but the pr is now outdated

Details

Error: PUT https://api.github.com/repos/DataDog/datadog-operator/pulls/1398/merge: 405 6 of 6 required status checks are expected. []

FullStacktrace:
activity error (type: github.GithubService_MergePullRequest, scheduledEventID: 41, startedEventID: 42, identity: 1@github-worker-59f6756d79-gprcs@): PUT https://api.github.com/repos/DataDog/datadog-operator/pulls/1398/merge: 405 6 of 6 required status checks are expected. [] (type: ErrorResponse, retryable: true)

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