OLM: do no use cert-manager

[qbarrand]

OLM provisions its own webhook certificates.
Do not include cert-manager as a dependency when deploying with OLM. Rework the directory layout to use cert-manager only when using make deploy.
Revert d4f87b0.

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This pull-request has been approved by: qbarrand

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[qbarrand]

/test all

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.38%. Comparing base (fa23a9b) to head (b9a1a1d).
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #770      +/-   ##
==========================================
- Coverage   79.09%   78.38%   -0.72%     
==========================================
  Files          51       54       +3     
  Lines        5109     4043    -1066     
==========================================
- Hits         4041     3169     -872     
+ Misses        882      679     -203     
- Partials      186      195       +9     

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[qbarrand]

/test all

[yevgeny-shnaidman]

/lgtm