reject atomic distributed transaction on savepoints and modified system settings

[harshit-gangal]

Description

This PR rejects a Atomic Distributed Transaction Commit when the session have modified system settings or using temporary table or have savepoints inside the transaction.

This will be removed when the support is added for it.

Related Issue(s)

• RFC: Atomic Distributed Transactions #16245

Checklist

• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

[vitess-bot]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.45%. Comparing base (83b37b8) to head (d3a9131).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16835      +/-   ##
==========================================
- Coverage   69.54%   69.45%   -0.09%     
==========================================
  Files        1569     1571       +2     
  Lines      202555   203012     +457     
==========================================
+ Hits       140865   141001     +136     
- Misses      61690    62011     +321     

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