Update Ironbank

This MR contains the following updates:

Package	Update	Change
gluon	minor	0.5.15 -> 0.6.2
registry1.dso.mil/ironbank/opensource/grafana/rollout-operator (source)	minor	v0.26.0 -> v0.27.0
registry1.dso.mil/ironbank/opensource/nginx/nginx (source)	minor	1.27.5 -> 1.28.0

Additional Changes:

• Disable MinIO storage for package test-values.yaml
• Disable other uneccesary packages for test-values.yaml (loki, bbctl, alloy)
• Fix gluon test indentation
• Update DEV_MAINTENANCE.docs for Operatorless istio values

Complete MR checklist

Assignee

• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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• Tested and Validated changes

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Upgrade Notices

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