Externalize MPC embedded scripts - KFLUXINFRA-4159 Prod - Ring1

[celeztyne]

This PR is from #12867 that has been divided in two rings. In this ring1 following production clusters with lower usage are included:

• kflux-fedora-01
• kflux-prd-rh03
• kflux-osp-p01
• kflux-rhel-p01
• stone-prod-p01

The kustomization configuration for charts on these clusters are using new {production,production-downstream}/base/host-config-chart/{files,templates}, while other production clusters are still pointing charts config to old/current base in multi-platform-controller/base

If all goes well we implement in ring2 after a week.

Chages here includes correcting bugs, security and some cosmetic/formatting issues.

The most relevant change might be creating the MIME/script cloud-init-userdata.tpl to be used as "template", explanation from Oscar #11239 (comment)

What could go wrong: This change might impact some VMs in production
Rollback plan: Revert the PR and redeploy. No data migration involved.
Testing: PR Validated in staging with no issues (#11858)

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[github-actions]

Kustomize Render Diff

Comparing 7e9a1ef3c → 128159d2b

Component	Environment	Changes
components/multi-platform-controller/production-downstream/kflux-osp-p01	production	+2 -73
components/multi-platform-controller/production-downstream/kflux-rhel-p01	production	+1 -73
components/multi-platform-controller/production-downstream/stone-prod-p01	production	+1 -73
components/multi-platform-controller/production/kflux-fedora-01	production	+1 -0
components/multi-platform-controller/production/kflux-prd-rh03	production	+1 -73

Total: 5 components, +6 -292 lines

📋 Full diff available in the workflow summary and as a downloadable artifact.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.11%. Comparing base (7e9a1ef) to head (0d7a407).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13051   +/-   ##
=======================================
  Coverage   57.11%   57.11%           
=======================================
  Files          23       23           
  Lines        1455     1455           
=======================================
  Hits          831      831           
  Misses        548      548           
  Partials       76       76           

Flag	Coverage Δ
go	57.11% <ø> (ø)

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