Update Prometheus functionality in adapter and common controller

[sgayangi]

This PR contains the following changes.

1. The operator present in both the adapter and common controller inherently have a metrics endpoint available by default at port 8080. Instead of spinning up an additional Prometheus server, the code was refactored to utilise the existing metrics endpoint to expose Prometheus metrics.
2. Additionally, the existing method of providing the metrics bind address needed to be refactored due to the gateway API dependency update from PR Upgrade K8s gateway api to v1.0.0 #2121.
3. This PR fixes Update Prometheus functionality in adapter and common controller #2134

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.95%. Comparing base (a47add3) to head (64893bb).
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2135   +/-   ##
=======================================
  Coverage   27.95%   27.95%           
=======================================
  Files         124      124           
  Lines       14583    14583           
  Branches     2672     2672           
=======================================
  Hits         4076     4076           
  Misses      10376    10376           
  Partials      131      131           

Flag	Coverage Δ
adapter	27.63% <ø> (ø)
common-controller	4.07% <ø> (ø)
config-deployer-service	26.03% <ø> (ø)
idp-domain-service	80.21% <ø> (ø)
router	∅ <ø> (∅)

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