feat(streaming): migrate AppendOnlyTopNExecutor to ExecutorV2

[pleiadesian]

What's changed and what's your intention?

As title. This PR depends on #1737.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

Close #1738

[codecov]

Codecov Report

Merging #1739 (cb52095) into main (fc93222) will decrease coverage by 0.03%.
The diff coverage is 84.58%.

@@            Coverage Diff             @@
##             main    #1739      +/-   ##
==========================================
- Coverage   71.12%   71.09%   -0.04%     
==========================================
  Files         603      604       +1     
  Lines       78066    78133      +67     
==========================================
+ Hits        55524    55547      +23     
- Misses      22542    22586      +44     

Flag	Coverage Δ
rust	71.09% <84.58%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/stream/src/executor/test_utils.rs	70.63% <ø> (-6.35%)	⬇️
src/stream/src/executor/top_n_appendonly.rs	0.00% <0.00%> (-84.54%)	⬇️
src/stream/src/executor_v2/mod.rs	55.81% <ø> (ø)
src/stream/src/executor_v2/v1_compat.rs	34.09% <0.00%> (-4.38%)	⬇️
src/stream/src/executor_v2/top_n_executor.rs	45.83% <72.00%> (+28.44%)	⬆️
src/stream/src/executor_v2/top_n_appendonly.rs	91.18% <91.18%> (ø)
src/stream/src/executor_v2/top_n.rs	90.76% <100.00%> (ø)
src/stream/src/executor/mod.rs	57.96% <0.00%> (-1.77%)	⬇️
... and 1 more

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[lmatz]

LGTM! Sorry for the delay, a lot of things going on these days...