Upgrade Thanos to v0.26 in pre and ops-stg

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

• Upgrade thanos-store in pre to v0.26.0
• Upgrade thanos-query and thanos-query-frontend in ops-stg 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

• Update thanos-query flags to use --endpoint instead of --store, deprecated in v0.24.0:

  #4282 Query: breaking ⚠️ Add --endpoint flag to the querier. The --store flag will eventually be replaced.

  -- https://github.com/thanos-io/thanos/releases/tag/v0.24.0

Already deployed manually in both envs for testing: https://thanos-query-stg.ops.gitlab.net/status