ttl: always enable all read engines for TTL sessions (#56604)

[ti-chi-bot]

This is an automated cherry-pick of #56604

What problem does this PR solve?

Issue Number: close #56402

Problem Summary:

If a TiDB node doesn't enable TiKV read engine, running TTL task may fail if the table doesn't have tiflash replica.

What changed and how does it work?

This PR always enables all read engines for TTL sessions.

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

Fix the issue that if the `isolation-read.engines` config is set without `tikv`, the TTL task may fail.

[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.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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[codecov]

Codecov Report

Attention: Patch coverage is 58.62069% with 12 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@79f7424). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #56807   +/-   ##
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  Coverage               ?   71.1898%           
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  Files                  ?       1466           
  Lines                  ?     423253           
  Branches               ?          0           
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  Hits                   ?     301313           
  Misses                 ?     101418           
  Partials               ?      20522           

Flag	Coverage Δ
unit	71.1898% <58.6206%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.3021% <0.0000%> (?)

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lcwangchao, YangKeao

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Needs approval from an approver in each of these files:

• OWNERS [YangKeao,lcwangchao]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-30 02:19:33.98149476 +0000 UTC m=+402686.820650306: ☑️ agreed by lcwangchao.
• 2024-10-30 03:00:07.507976928 +0000 UTC m=+405120.347132470: ☑️ agreed by YangKeao.