fix(test): temporal join watermark test select eowc skipif in-memory and inc sleep time

[yuhao-su]

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What's changed and what's your intention?

#12172

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
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[codecov]

Codecov Report

Merging #12581 (e33789c) into main (f869d8b) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #12581   +/-   ##
=======================================
  Coverage   69.32%   69.32%           
=======================================
  Files        1469     1469           
  Lines      240981   240981           
=======================================
+ Hits       167066   167068    +2     
+ Misses      73915    73913    -2     

Flag	Coverage Δ
rust	69.32% <ø> (+<0.01%)	⬆️

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see 12 files with indirect coverage changes

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