chore: add custom log level support for common_telemetry::init_default_ut_logging()

[e1ijah1]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

add custom log level support for common_telemetry::init_default_ut_logging()

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

[e1ijah1]

cc @killme2008 @evenyag @waynexia Please take a look if you are available.

[waynexia]

👍

[codecov]

Codecov Report

Merging #864 (1c80b02) into develop (a9b42b4) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #864      +/-   ##
===========================================
- Coverage    86.32%   86.17%   -0.16%     
===========================================
  Files          422      422              
  Lines        55668    55669       +1     
===========================================
- Hits         48056    47971      -85     
- Misses        7612     7698      +86     

Flag	Coverage Δ
rust	86.17% <100.00%> (-0.16%)	⬇️

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

Impacted Files	Coverage Δ
src/common/telemetry/src/logging.rs	88.50% <100.00%> (+0.13%)	⬆️
src/object-store/src/test_util.rs	0.00% <0.00%> (-100.00%)	⬇️
src/datanode/src/instance.rs	50.00% <0.00%> (-15.87%)	⬇️
src/meta-srv/src/handler/collect_stats_handler.rs	81.08% <0.00%> (-13.52%)	⬇️
tests-integration/src/test_util.rs	87.08% <0.00%> (-12.45%)	⬇️
src/servers/src/error.rs	34.54% <0.00%> (-7.28%)	⬇️
src/frontend/src/table/scan.rs	85.18% <0.00%> (-5.56%)	⬇️
src/sql/src/parser.rs	79.39% <0.00%> (-2.02%)	⬇️
src/meta-srv/src/service/heartbeat.rs	86.17% <0.00%> (-1.07%)	⬇️
src/common/substrait/src/df_logical.rs	77.89% <0.00%> (+0.87%)	⬆️

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[killme2008]

LGTM