Set name for COPY insert buffer hash table

[svenklemm]

Having the hash table named makes debugging easier as the name is used for the MemoryContext used by the hash table.

Disable-check: force-changelog-changed

[github-actions]

@shhnwz, @RafiaSabih: please review this pull request.

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[codecov]

Codecov Report

Merging #5350 (f0af830) into main (7e43c70) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5350      +/-   ##
==========================================
+ Coverage   90.70%   90.80%   +0.10%     
==========================================
  Files         225      225              
  Lines       52020    45578    -6442     
==========================================
- Hits        47183    41386    -5797     
+ Misses       4837     4192     -645     

Impacted Files	Coverage Δ
src/copy.c	94.55% <100.00%> (-0.14%)	⬇️
tsl/src/remote/tuplefactory.c	72.60% <0.00%> (-16.91%)	⬇️
src/bgw_policy/chunk_stats.c	81.53% <0.00%> (-4.01%)	⬇️
tsl/test/src/remote/dist_commands.c	90.62% <0.00%> (-3.97%)	⬇️
src/nodes/chunk_append/transform.c	96.66% <0.00%> (-3.34%)	⬇️
src/partitioning.c	85.98% <0.00%> (-3.10%)	⬇️
src/loader/bgw_launcher.c	89.22% <0.00%> (-2.85%)	⬇️
src/import/planner.c	62.40% <0.00%> (-2.76%)	⬇️
src/bgw/scheduler.c	84.22% <0.00%> (-2.74%)	⬇️
tsl/src/fdw/estimate.c	77.18% <0.00%> (-2.36%)	⬇️
... and 193 more

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