fix: replace inspect with inspect_err for error logging

[chlins]

This pull request makes minor improvements to error handling in the codebase by updating how errors are logged when certain parameters are missing or invalid. Instead of using .inspect, the code now uses .inspect_err, which ensures error messages are only logged when an error actually occurs.

Error handling improvements:

• In dragonfly-client-backend/src/http.rs, updated two places in the HTTP backend implementation to use .inspect_err for logging when the request header is missing. [1] [2]
• In dragonfly-client/src/dynconfig/mod.rs, changed the error logging for invalid addresses in the Dynconfig implementation to use .inspect_err.

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

[LunaWhispers]

lgtm

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 48.58%. Comparing base (3248b9d) to head (85d64a5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client/src/dynconfig/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1298      +/-   ##
==========================================
- Coverage   48.59%   48.58%   -0.01%     
==========================================
  Files          60       60              
  Lines       15154    15154              
==========================================
- Hits         7364     7363       -1     
- Misses       7790     7791       +1     

Files with missing lines	Coverage Δ
dragonfly-client-backend/src/http.rs	98.13% <100.00%> (-0.27%)	⬇️
dragonfly-client/src/dynconfig/mod.rs	0.00% <0.00%> (ø)

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[gaius-qi]

LGTM