drop dev container as no one is maintaining it

[dprotaso]

Fixes #14537

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.49%. Comparing base (bf7dbbb) to head (ef2b0b3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15460      +/-   ##
==========================================
+ Coverage   84.47%   84.49%   +0.02%     
==========================================
  Files         219      219              
  Lines       13605    13605              
==========================================
+ Hits        11493    11496       +3     
+ Misses       1739     1738       -1     
+ Partials      373      371       -2     

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[ReToCode]

/lgtm
/approve

[knative-prow]

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