chore: [branch-0.10] perf: Improve BroadcastExchangeExec conversion

[andygrove]

Which issue does this PR close?

Closes #.

Rationale for this change

Backport #2417

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (branch-0.10@6023495). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...n/scala/org/apache/comet/rules/CometExecRule.scala	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             branch-0.10    #2501   +/-   ##
==============================================
  Coverage               ?   57.89%           
  Complexity             ?     1401           
==============================================
  Files                  ?      147           
  Lines                  ?    13499           
  Branches               ?     2378           
==============================================
  Hits                   ?     7815           
  Misses                 ?     4448           
  Partials               ?     1236           

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[mbutrovich]

Thanks @andygrove