releases: add the change of "max_execution_time"

[lilin90]

What is changed, added or deleted? (Required)

Adds the behavior change of max_execution_time to the table of system variables in the Compatibility changes section of v6.5.0 release notes. Ref: pingcap/docs-cn#14282

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v8.0 (TiDB 8.0 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)

What is the related PR or file link(s)?

• This PR is translated from: releases: add the change of "max_execution_time" docs-cn#18443
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[Benjamin2037]

LGTM

[ti-chi-bot]

@Benjamin2037: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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LGTM

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[lilin90]

I made some changes according to your input. @Benjamin2037 Would you please take another look? Thanks!

[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-29 08:23:28.423768773 +0000 UTC m=+1031403.558218896: ☑️ agreed by qiancai.

[lilin90]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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• OWNERS [lilin90]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #18745.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #18746.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #18747.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #18748.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #18749.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #18750.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #18751.