Remove no longer used compression code

[svenklemm]

The recent refactoring of INSERT into compression chunk made this code obsolete but forgot to remove it in that patch.

[github-actions]

@fabriziomello, @pmwkaa: please review this pull request.

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[codecov]

Codecov Report

Merging #5183 (3da7fd1) into main (73df496) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5183      +/-   ##
==========================================
+ Coverage   89.28%   89.39%   +0.11%     
==========================================
  Files         225      225              
  Lines       51779    51691      -88     
==========================================
- Hits        46230    46211      -19     
+ Misses       5549     5480      -69     

Impacted Files	Coverage Δ
src/cross_module_fn.c	67.55% <ø> (ø)
tsl/src/compression/compression.c	95.57% <ø> (+8.70%)	⬆️
tsl/src/compression/compression.h	0.00% <ø> (ø)
tsl/src/init.c	96.00% <ø> (ø)
src/bgw/scheduler.c	83.88% <0.00%> (-3.84%)	⬇️
src/loader/bgw_launcher.c	89.51% <0.00%> (-2.55%)	⬇️
src/loader/bgw_message_queue.c	88.63% <0.00%> (-0.57%)	⬇️
src/bgw/job.c	93.24% <0.00%> (-0.17%)	⬇️
tsl/src/bgw_policy/job.c	87.28% <0.00%> (-0.05%)	⬇️
src/bgw/job_stat.c	92.18% <0.00%> (+0.31%)	⬆️
... and 1 more

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