DDAI Create strategy review suggestion

[tbavelier]

What does this PR do?

• Preserves createStrategy field over updates + updates lastTransition there only when there's a change
• Update tests

Motivation

• Matching DDA behaviour

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

:x: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 37.10%. Comparing base (09cb5c0) to head (39c2b5b).

Files with missing lines	Patch %	Lines
pkg/agentprofile/agent_profile.go	85.00%	3 Missing :warning:

Additional details and impacted files

@@                       Coverage Diff                        @@
##           khewonc/create-strategy-ddai    #2407      +/-   ##
================================================================
+ Coverage                         37.07%   37.10%   +0.03%     
================================================================
  Files                               288      288              
  Lines                             24553    24566      +13     
================================================================
+ Hits                               9102     9115      +13     
  Misses                            14739    14739              
  Partials                            712      712              

Flag	Coverage Δ
unittests	37.10% <85.71%> (+0.03%)	:arrow_up:

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

Files with missing lines	Coverage Δ
pkg/agentprofile/status.go	67.53% <100.00%> (ø)
pkg/agentprofile/agent_profile.go	73.80% <85.00%> (+0.88%)	:arrow_up:

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