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)

• 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[bot]]

Review Checklist

Hello reviewers! :wave: Please follow this checklist when reviewing this Pull Request.

General

• [ ] Ensure that the Pull Request has a descriptive title.
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• [ ] Protobuf changes should be wire-compatible.
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• [ ] vtctl command output order should be stable and awk-able.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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