responsibleai: Remove old manager namespaces

[gaugup]

Description

The deprecation message for old manager namespaces was sent quite a few releases ago. Hence removing the old manager namespaces.

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[codecov-commenter]

Codecov Report

Merging #1564 (bf47de9) into main (c98a1d8) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1564      +/-   ##
==========================================
- Coverage   88.90%   88.86%   -0.05%     
==========================================
  Files         111      105       -6     
  Lines        5470     5449      -21     
==========================================
- Hits         4863     4842      -21     
  Misses        607      607              

Flag	Coverage Δ
unittests	88.86% <ø> (-0.05%)	⬇️

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[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/RemoveOldManagerNamespace/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/RemoveOldManagerNamespace/dashboard/index.html