Simplify ts_indexing_relation_has_primary_or_unique_index

[svenklemm]

Rely on postgres functionality for index column tracking instead of rolling our own.

[github-actions]

@RafiaSabih, @sb230132: please review this pull request.

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[codecov]

Codecov Report

Merging #5415 (b2fbc96) into main (474b09b) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5415      +/-   ##
==========================================
- Coverage   90.69%   90.66%   -0.04%     
==========================================
  Files         226      227       +1     
  Lines       52559    52571      +12     
==========================================
- Hits        47671    47664       -7     
- Misses       4888     4907      +19     

Impacted Files	Coverage Δ
src/indexing.c	95.21% <100.00%> (+0.65%)	⬆️
src/bgw/scheduler.c	84.39% <0.00%> (-4.10%)	⬇️
src/loader/bgw_launcher.c	89.51% <0.00%> (-2.55%)	⬇️
src/ts_catalog/chunk_data_node.c	96.44% <0.00%> (-2.45%)	⬇️
src/loader/bgw_message_queue.c	86.36% <0.00%> (-2.28%)	⬇️
tsl/src/reorder.c	85.49% <0.00%> (-0.22%)	⬇️
src/bgw/job.c	93.24% <0.00%> (-0.17%)	⬇️
tsl/src/bgw_policy/job.c	87.54% <0.00%> (-0.05%)	⬇️
src/chunk.c	93.74% <0.00%> (-0.01%)	⬇️
... and 13 more

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