chore: cleanup Monitoring's initialize action

[lburgazzoli]

The Monitoring controller is initialized only when the platform is
managed, hence there's no need to conditionally add manifests

Description

How Has This Been Tested?

Screenshot or short clip

Merge criteria

• You have read the contributors guide.
• Commit messages are meaningful - have a clear and concise summary and detailed explanation of what was changed and why.
• Pull Request contains a description of the solution, a link to the JIRA issue, and to any dependent or related Pull Request.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 19.70%. Comparing base (2258161) to head (b7dd5a3).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rvices/monitoring/monitoring_controller_actions.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1542      +/-   ##
==========================================
+ Coverage   19.69%   19.70%   +0.01%     
==========================================
  Files         160      160              
  Lines       10985    10979       -6     
==========================================
  Hits         2163     2163              
+ Misses       8594     8588       -6     
  Partials      228      228              

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ykaliuta, zdtsw

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