[CECO-1860][DatadogGenericResource] Refactor handler 2

[tbavelier]

What does this PR do?

Refactors CRUD operations

Motivation

What inspired you to submit this pull request?

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

QA to be done on the "main" PR that will be merged

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

Attention: Patch coverage is 4.76190% with 120 lines in your changes missing coverage. Please review.

Project coverage is 48.91%. Comparing base (049c0b0) to head (090df80).

Files with missing lines	Patch %	Lines
...nternal/controller/datadoggenericresource/utils.go	4.00%	48 Missing ⚠️
...al/controller/datadoggenericresource/synthetics.go	0.00%	47 Missing ⚠️
...nal/controller/datadoggenericresource/notebooks.go	13.79%	25 Missing ⚠️

Additional details and impacted files

@@                               Coverage Diff                                @@
##           tbavelier/levan-m/generic-resoource-refactor    #1640      +/-   ##
================================================================================
- Coverage                                         48.96%   48.91%   -0.05%     
================================================================================
  Files                                               217      217              
  Lines                                             20880    20903      +23     
================================================================================
+ Hits                                              10223    10225       +2     
- Misses                                            10117    10138      +21     
  Partials                                            540      540              

Flag	Coverage Δ
unittests	48.91% <4.76%> (-0.05%)	⬇️

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

Files with missing lines	Coverage Δ
...nal/controller/datadoggenericresource/notebooks.go	11.47% <13.79%> (+0.36%)	⬆️
...al/controller/datadoggenericresource/synthetics.go	37.75% <0.00%> (+6.66%)	⬆️
...nternal/controller/datadoggenericresource/utils.go	53.39% <4.00%> (-39.59%)	⬇️

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