chore(dashboard): update TiDB Dashboard to v8.4.0-6a0d342d [master]

[baurine]

What problem does this PR solve?

Issue Number: ref #4257

Update TiDB Dashboard to v8.4.0-6a0d342d.

Release note

None

[ti-chi-bot]

Hi @baurine. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[rleungx]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.60%. Comparing base (193fe6c) to head (ff0a74a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8581      +/-   ##
==========================================
- Coverage   77.69%   77.60%   -0.10%     
==========================================
  Files         474      474              
  Lines       61851    61852       +1     
==========================================
- Hits        48055    47998      -57     
- Misses      10266    10312      +46     
- Partials     3530     3542      +12     

Flag	Coverage Δ
unittests	77.60% <100.00%> (-0.10%)	⬇️

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-28 06:08:09.94723098 +0000 UTC m=+936885.081681102: ☑️ agreed by rleungx.
• 2024-08-28 07:44:00.704996609 +0000 UTC m=+942635.839446731: ☑️ agreed by lhy1024.

[mornyx]

/cc @niubell PTAL, thanks. This PR adds a new configuration to TiDB dashboard.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lhy1024, niubell, rleungx

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Needs approval from an approver in each of these files:

• OWNERS [lhy1024,rleungx]
• conf/OWNERS [niubell]
• server/config/OWNERS [niubell]

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