api: add custom timeout for external auth service

[sudiptob2]

Fixes #6679

E2E Test
I set the timeout to 1ms, which should cause an immediate timeout and return a 403 response, thereby verifying the effect of the custom timeout.

In ext_auth_http_service.go and ext_auth_http_service.go the default timeout of 10s is in effect, which allows these to pass.

Release Notes: Yes/No

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.09%. Comparing base (9458c0b) to head (97eabcc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6682   +/-   ##
=======================================
  Coverage   71.09%   71.09%           
=======================================
  Files         225      225           
  Lines       39798    39810   +12     
=======================================
+ Hits        28295    28304    +9     
- Misses       9841     9844    +3     
  Partials     1662     1662           

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[arkodg]

LGTM thanks

[kkk777-7]

Looking at issue #6679, it seems the user wants to set timeouts shorter than 1 second, such as 500 ms.
In this case, the fact that the timeout is truncated to 0s may be unintended behavior.

Since durationpb.Duration also has a nanoseconds field, should we support it?
https://pkg.go.dev/google.golang.org/[email protected]/types/known/durationpb#Duration

[sudiptob2]

I see. Yeah that would be a nice improvement. will update the PR shortly

[kkk777-7]

LGTM thanks!