Fix _timescaledb_functions.remove_dropped_chunk_metadata

[svenklemm]

The removal function would only remove chunk_constraints that are part of dimension constraints. This patch changes it to remove all constraints of a chunk.

Fixes #6905

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.68%. Comparing base (59f50f2) to head (bcc35b7). Report is 167 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6911      +/-   ##
==========================================
+ Coverage   80.06%   81.68%   +1.61%     
==========================================
  Files         190      198       +8     
  Lines       37181    36836     -345     
  Branches     9450     9634     +184     
==========================================
+ Hits        29770    30088     +318     
+ Misses       2997     2876     -121     
+ Partials     4414     3872     -542     

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