Upgrade thanos-store to v0.26 in prod environments

Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15790

• Upgrade thanos-store in ops, gstg, stgsub and org-ci to v0.26.0
• Update tracing configuration to use GOOGLE_CLOUD instead of STACKDRIVER, deprecated in v0.26.0:

  #4838 Tracing: Chanced client for Stackdriver which deprecated "type: STACKDRIVER" in tracing YAML configuration. Use type: GOOGLE_CLOUD instead (STACKDRIVER type remains for backward compatibility).

  -- https://github.com/thanos-io/thanos/releases/tag/v0.26.0

Non-prod environments done in !399 (merged).