fix: DH-19601: Pin aggregations to the top in input tables

[gzh2003]

For DH-19601. Input tables with aggregations in the footer were experiencing conflicts with insertions to the pending area. This pr pins aggregations to the top of input tables, that way we have the bottom of the table reserved for pending rows.

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 44.59%. Comparing base (e32b68f) to head (003737b).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/iris-grid/src/IrisGrid.tsx	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2502      +/-   ##
==========================================
- Coverage   44.62%   44.59%   -0.04%     
==========================================
  Files         759      763       +4     
  Lines       42548    42700     +152     
  Branches    10693    10741      +48     
==========================================
+ Hits        18988    19041      +53     
- Misses      23549    23648      +99     
  Partials       11       11              

Flag	Coverage Δ
unit	44.59% <42.85%> (-0.04%)	⬇️

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[mofojed]

Great work!