Remove ImageSpec experiment warning

[ppiegaze]

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• I updated the documentation accordingly.
• All new and existing tests passed.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.01%. Comparing base (5cfd004) to head (aa5f4a2).
Report is 203 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5510      +/-   ##
==========================================
- Coverage   61.10%   61.01%   -0.09%     
==========================================
  Files         794      794              
  Lines       51213    51444     +231     
==========================================
+ Hits        31295    31390      +95     
- Misses      17037    17162     +125     
- Partials     2881     2892      +11     

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.73% <ø> (-0.18%)	⬇️
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	68.09% <ø> (-0.21%)	⬇️
unittests-flyteidl	79.04% <ø> (-0.26%)	⬇️
unittests-flyteplugins	61.85% <ø> (-0.10%)	⬇️
unittests-flytepropeller	57.30% <ø> (-0.03%)	⬇️
unittests-flytestdlib	65.82% <ø> (+0.06%)	⬆️

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