🌱 OPRUN-4138 Make ClusterExtensionRevision .spec.phases optional

[pedjak]

Description

Given that at the creation we can create a revision with no phases, we should
declare .spec.phases as optional.

Added initial set of unit tests to assert CER .spec immutability.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.28%. Comparing base (33fdce2) to head (a77e58f).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2230      +/-   ##
==========================================
+ Coverage   72.05%   72.28%   +0.23%     
==========================================
  Files          85       85              
  Lines        8405     8440      +35     
==========================================
+ Hits         6056     6101      +45     
+ Misses       1948     1939       -9     
+ Partials      401      400       -1     

Flag	Coverage Δ
e2e	39.07% <ø> (-0.11%)	⬇️
experimental-e2e	46.30% <ø> (+0.22%)	⬆️
unit	57.15% <ø> (+0.15%)	⬆️

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[tmshort]

/approve
/lgtm

[openshift-ci]

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