feat: handle URL path prefix in InfluxDB

[NguyenHoangSon96]

Closes #172

Proposed Changes

• Support URL with a path prefix, currently we only support the root URL.
• Some test cases with timeout will now use ConstantFlightServerDelayed class for consistent results.
• Add a test case for "write_port_overwrite" because Codecov complains.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.96%. Comparing base (c35f372) to head (3fd9f01).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
+ Coverage   69.79%   69.96%   +0.16%     
==========================================
  Files          35       35              
  Lines        2314     2317       +3     
==========================================
+ Hits         1615     1621       +6     
+ Misses        699      696       -3     

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[vlastahajek]

path should be added also for query API

[NguyenHoangSon96]

path should be added also for query API

I read that gRPC can't have a path prefix but I will check again.