CI: Deploy external valkey to one review envionment

What does this MR do?

CI: Deploy external valkey to one review envionment

  • Rename GKE 1.34 Gateway API vcluster environment to "flux" environment. This envionment is meant to deploy components meant not being default components yet.
  • Deploy external valkey to flux envionment.
  • Uses the latest official valkey chart (0.9.2, deploys valkey 9.0).

Relates CI: Test with a external Valkey (#6247 - closed)

Relates Document migration from bundled MinIO, Redis, a... (#6230 - closed)

Author checklist

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Required

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  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated.
  • Tests added/updated, and test plan for scenarios not covered by automated tests.
  • Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

Edited by Clemens Beck

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