statistics: add Destroy method and handle session recycling (#59546)

[ti-chi-bot]

This is an automated cherry-pick of #59546

What problem does this PR solve?

Issue Number: close #59524 close #59560

Problem Summary:

What changed and how does it work?

ref #59522

This is an alternative API design to solve the problem. I believe explicitly using destroy instead of exposing implementation details is a better approach to fix it.

I also added more logs to help us inspect error cases.

Note: This PR doesn’t address the root cause of the issues; it only ensures that we don’t encounter OOM problems. We still need to figure out why we’re running into this kind of stats loading.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Fix the issue that the internal session used by statistics may not be released and cause possible memory leak.
修复统计信息在使用的内部会话在遇到错误时可能没有被释放的问题，该问题可能导致内存泄漏。

[ti-chi-bot]

@Rustin170506 This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	e976ca0	link	true	/test check-dev
idc-jenkins-ci-tidb/build	e976ca0	link	true	/test build
idc-jenkins-ci-tidb/check_dev_2	e976ca0	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	e976ca0	link	true	/test unit-test
idc-jenkins-ci-tidb/mysql-test	e976ca0	link	true	/test mysql-test

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[Rustin170506]

6.5 shared one session for all submodules of stats.