Remove TTSOps pointer macros

[svenklemm]

Remove TTSOpsVirtualP, TTSOpsHeapTupleP, TTSOpsMinimalTupleP and
TTSOpsBufferHeapTupleP macros since they were only needed on PG11
to allow us to define compatibility macros for TupleTableSlot
operations.

[codecov]

Codecov Report

Merging #3298 (2bff470) into master (3b48d73) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3298   +/-   ##
=======================================
  Coverage   90.50%   90.51%           
=======================================
  Files         212      212           
  Lines       35494    35494           
=======================================
+ Hits        32124    32127    +3     
+ Misses       3370     3367    -3     

Impacted Files	Coverage Δ
src/compat.h	100.00% <ø> (ø)
src/event_trigger.c	96.32% <100.00%> (ø)
tsl/src/compression/compression.c	95.42% <100.00%> (ø)
tsl/src/nodes/gapfill/exec.c	97.00% <100.00%> (ø)
tsl/src/nodes/data_node_dispatch.c	97.08% <0.00%> (-0.25%)	⬇️
src/loader/bgw_message_queue.c	88.15% <0.00%> (+2.63%)	⬆️

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