fix(helm): pass full global values to image helper to respect new image standardization

[LukoJy3D]

What this PR does / why we need it:

In 91e11fc, image registry standardization was introduced, yet it only overrides components using baseImage.

If all good with such approach will update docs to note this change and problems noted in the referenced issue

Which issue(s) this PR fixes:
#19662

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[jkroepke]

Hi @LukoJy3D

I favorite #19347 - or I do not get the root cause of #19662