fix: correct request validation

[GG2002]

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)
  [Bug]: check_intervals will not validate correctly in certain nested txn scenarios #410
• what changes does this pull request make?
  Corrected the behavior of request validation. Please refer to this proposal for the general idea. The specific code behavior is slightly different from what is stated in the proposal, but the idea of finding out LCA is the same.
• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)
  No.

Reopen #942

[codecov]

Codecov Report

Attention: Patch coverage is 91.11111% with 16 lines in your changes missing coverage. Please review.

Project coverage is 75.85%. Comparing base (e35b35a) to head (6f6798c).
Report is 192 commits behind head on master.

Files	Patch %	Lines
crates/xlineapi/src/request_validation.rs	87.95%	6 Missing and 4 partials ⚠️
crates/utils/src/lca_tree.rs	93.81%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #963      +/-   ##
==========================================
+ Coverage   75.55%   75.85%   +0.30%     
==========================================
  Files         180      188       +8     
  Lines       26938    27990    +1052     
  Branches    26938    27990    +1052     
==========================================
+ Hits        20353    21233     +880     
- Misses       5366     5451      +85     
- Partials     1219     1306      +87     

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