fix: properly mutate flux ocirepo and helmrepo objects when using the registry proxy

[AustinAbro321]

Description

This fixes a bug with the registry proxy solution, where it does not work with flux and helm repo objects since the clusterip / hostname of the service is not added to the secret and was not returned.

Related Issue

Fixes #4474

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

[netlify]

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[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/cluster/secrets.go	35.71%	25 Missing and 2 partials ⚠️

Files with missing lines	Coverage Δ
src/internal/agent/hooks/flux-helmrepo.go	77.50% <100.00%> (ø)
src/internal/agent/hooks/flux-ocirepo.go	85.12% <100.00%> (+2.47%)	⬆️
src/pkg/cluster/tunnel.go	9.22% <ø> (ø)
src/pkg/transform/image.go	94.82% <100.00%> (ø)
src/pkg/cluster/secrets.go	54.81% <35.71%> (-8.58%)	⬇️

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[a1994sc]

LGTM, one follow up comment for a different PR