lightning: reduce the "unable to get keyspace name" log level to DEBUG

[kennytm]

What problem does this PR solve?

Issue Number: close #54232

Problem Summary: When the keyspace-name is empty (default), and the user connecting to downstream TiDB is not a superuser, there will be a confusing "access denied" warning requesting CONFIG privilege. This confuses users to think that this privilege is actually required.

What changed and how does it work?

Just reduce the log level to DEBUG.

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [x] 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.

None

[tiprow[bot]]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 56.4606%. Comparing base (2b6595d) to head (3cc68ff). Report is 16 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54243         +/-   ##
=================================================
- Coverage   72.8358%   56.4606%   -16.3752%     
=================================================
  Files          1533       1682        +149     
  Lines        436130     622297     +186167     
=================================================
+ Hits         317659     351353      +33694     
- Misses        98825     246774     +147949     
- Partials      19646      24170       +4524     

Flag	Coverage Δ
integration	38.3353% <33.3333%> (?)
unit	71.8217% <100.0000%> (-0.0111%)	:arrow_down:

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	52.5848% <ø> (+6.4752%)	:arrow_up:

[lance6716]

/cc @GMHDBJD @D3Hunter

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-06-26 09:56:37.065488391 +0000 UTC m=+799923.550977221: :ballot_box_with_check: agreed by lance6716.
• 2024-06-27 06:52:10.082562214 +0000 UTC m=+875256.568051043: :ballot_box_with_check: agreed by GMHDBJD.

[lance6716]

/hold

wait to address comment

[hawkingrei]

/retest

[kennytm]

PTAL @D3Hunter

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, GMHDBJD, lance6716

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Needs approval from an approver in each of these files:

• ~~lightning/OWNERS~~ [D3Hunter,GMHDBJD,lance6716]
• ~~pkg/lightning/OWNERS~~ [D3Hunter,GMHDBJD,lance6716]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[D3Hunter]

/unhold

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #55053.