fix: disable path label in opendal for now

[shuiyisong]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Since switching to openDAL's Prometheus layer, we have not been able to set the layer multiple times, causing the path label to include the index`s uuid symbol, which causes the size of the label to explode.

Disable the path label for now because we're not using it for debugging anyway. We may reopen it later if openDAL supports dynamic path trim or some hook to decide path label dynamically.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.69%. Comparing base (7471f55) to head (63bf250).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5247      +/-   ##
==========================================
- Coverage   83.94%   83.69%   -0.25%     
==========================================
  Files        1198     1203       +5     
  Lines      222969   224150    +1181     
==========================================
+ Hits       187177   187610     +433     
- Misses      35792    36540     +748