Refactors Reconciler() Method for Kubernetes Provider

[danehans]

Refactors Kubernetes controller:

• Improves readability.
• Improves log messages.
• Updates the reconciler to continue processing a request even if dependent resources cannot be found.

Fixes #788

Signed-off-by: danehans daneyonhansen@gmail.com

[danehans]

cc: @chauhanshubham

[codecov-commenter]

Codecov Report

Merging #803 (84e720d) into main (fbc55a3) will increase coverage by 0.71%.
The diff coverage is 69.67%.

@@            Coverage Diff             @@
##             main     #803      +/-   ##
==========================================
+ Coverage   61.06%   61.77%   +0.71%     
==========================================
  Files          46       46              
  Lines        5674     6023     +349     
==========================================
+ Hits         3465     3721     +256     
- Misses       1980     2068      +88     
- Partials      229      234       +5     

Impacted Files	Coverage Δ
internal/cmd/server.go	7.82% <0.00%> (-0.07%)	⬇️
internal/gatewayapi/runner/runner.go	31.32% <0.00%> (-1.59%)	⬇️
internal/gatewayapi/zz_generated.deepcopy.go	0.00% <0.00%> (ø)
internal/ir/infra.go	67.41% <ø> (ø)
internal/ir/xds.go	76.82% <ø> (ø)
internal/message/types.go	0.00% <ø> (ø)
internal/provider/kubernetes/routes.go	57.74% <0.00%> (ø)
internal/provider/kubernetes/controller.go	50.09% <20.23%> (-0.01%)	⬇️
internal/gatewayapi/helpers_v1alpha2.go	27.77% <33.33%> (+7.14%)	⬆️
internal/gatewayapi/contexts.go	75.94% <72.15%> (-1.22%)	⬇️
... and 8 more

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[danehans]

This PR is required to enable the HTTPRouteReferenceGrant conformance test.

[danehans]

Superseded by #793