Remove ChunkDispatch from ModifyHypertable

[svenklemm]

• Get rid of unused ChunkDispatch fields
• Move has_dropped_attrs to ChunkTupleRouting
• ++
• Remove ChunkInsertState from ChunkDispatch
• Remove ChunkDispatch from ModifyHypertable

[github-actions]

@Poroma-Banerjee, @pnthao: please review this pull request.

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[codecov]

Codecov Report

❌ Patch coverage is 85.10638% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.51%. Comparing base (c6d8af6) to head (61f9507).

Files with missing lines	Patch %	Lines
src/nodes/modify_hypertable.c	81.81%	2 Missing and 2 partials ⚠️
src/nodes/modify_hypertable_exec.c	86.95%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8619      +/-   ##
==========================================
+ Coverage   82.46%   82.51%   +0.05%     
==========================================
  Files         248      248              
  Lines       47649    47605      -44     
  Branches    12102    12095       -7     
==========================================
- Hits        39293    39282      -11     
- Misses       3489     3510      +21     
+ Partials     4867     4813      -54     

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