[Dashboard] Replace DashboardLastForceSyncTime with LastForceSyncTime

[tbavelier]

What does this PR do?

• Cherry-pick [Dashboard] Replace DashboardLastForceSyncTime with LastForceSyncTime #1410

Motivation

• Refer to original 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 (23cb15b) to head (7c03ea5).

Additional details and impacted files

@@           Coverage Diff           @@
##             v1.9    #1411   +/-   ##
=======================================
  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
api/datadoghq/v1alpha1/datadogdashboard_types.go	100.00% <ø> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 23cb15b...7c03ea5. Read the comment docs.

[tbavelier]

/merge

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in v1.9 is 0s.

Use /merge -c to cancel this operation!