Add new tests to .gitignore list

[sb230132]

Since new tests specific to PG15 were added, these tests which generated .sql files needs to be added to .gitnore

[codecov]

Codecov Report

Merging #4934 (f5d71bc) into main (6c73b61) will increase coverage by 0.00%.
The diff coverage is 40.00%.

@@           Coverage Diff           @@
##             main    #4934   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files         226      226           
  Lines       50818    50826    +8     
=======================================
+ Hits        45490    45498    +8     
  Misses       5328     5328           

Impacted Files	Coverage Δ
src/chunk.h	100.00% <ø> (ø)
src/nodes/chunk_append/planner.c	93.08% <ø> (ø)
src/chunk.c	91.07% <16.66%> (-0.09%)	⬇️
src/bgw/job.c	93.39% <50.00%> (-0.59%)	⬇️
src/process_utility.c	90.17% <100.00%> (ø)
src/bgw/job_stat.c	91.87% <0.00%> (-0.32%)	⬇️
tsl/src/bgw_policy/job.c	88.31% <0.00%> (-0.05%)	⬇️
src/bgw/scheduler.c	86.18% <0.00%> (+0.76%)	⬆️
src/loader/bgw_message_queue.c	88.63% <0.00%> (+2.27%)	⬆️

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