fix: config deadlock by trying to acquire a read lock twice

[atzoum]

Description

Internal callers which have already acquired a read lock on vLock are now using isSetInternal which doesn't acquire any lock.

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (fda5211) 79.37% compared to head (677a087) 79.38%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #118   +/-   ##
=======================================
  Coverage   79.37%   79.38%           
=======================================
  Files          68       68           
  Lines        5087     5089    +2     
=======================================
+ Hits         4038     4040    +2     
  Misses        849      849           
  Partials      200      200           

Files Changed	Coverage Δ
config/config.go	82.79% <100.00%> (+0.18%)	⬆️
config/hotreloadable.go	87.62% <100.00%> (ø)
config/load.go	92.26% <100.00%> (ø)

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