sessionctx: change innodb large prefix default (#24555)

[ti-srebot]

cherry-pick #24555 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25687

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git push git@github.com:ti-srebot/tidb.git pr/25687:release-5.0-80a557eb4956

---

What problem does this PR solve?

Problem Summary:

I received more details about #23541 and it looks like the original PR did not change a required setting according to this blog post: https://nova.moe/run-jira-on-tidb/

What is changed and how it works?

What's Changed:

The default for a noop variable changes. It is safe to do this, since the TiDB behavior reflects the 'on' state.

Related changes

• Original PR variable: Add innodb_default_row_format as noop #23568

Check List

Tests

• Integration test

Side effects

• None

Release note

• No release note

[ti-srebot]

/run-all-tests

[morgo]

@wjhuang2016 @xhebox this is now ready for review.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• wjhuang2016
• xhebox

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[xhebox]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6f255a6

[ti-chi-bot]

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