Avoid duplicated writer nodes when AQE enabled

[comphead]

Which issue does this PR close?

Closes #2971 .

Rationale for this change

Comet executed the write twice when AQE enabled, the write should be done only once. The reason was the AQE runs its set of rules and applies modifications based on original plan and looks for WriteFilesExec or DataWriteCommandExec. Those command were replaced by Comet and AQE inserts another write layer on top of Comet layer

What changes are included in this PR?

How are these changes tested?

[comphead]

check the count is just 1

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.59%. Comparing base (f09f8af) to head (1f0170b).
⚠️ Report is 800 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/scala/org/apache/comet/rules/CometExecRule.scala	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2982      +/-   ##
============================================
+ Coverage     56.12%   59.59%   +3.46%     
- Complexity      976     1366     +390     
============================================
  Files           119      167      +48     
  Lines         11743    15495    +3752     
  Branches       2251     2569     +318     
============================================
+ Hits           6591     9234    +2643     
- Misses         4012     4962     +950     
- Partials       1140     1299     +159     

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[andygrove]

LGTM. Thanks @comphead