[v10.0.x] CI: Make RGM the main pipeline for prerelease (#72532)

CI: Make RGM the main pipeline for prerelease (#72295)

* Make RGM the main pipeline for prerelease

* Use grafana/grafana-build:dev-bd41660

* Use grafana/grafana-build:dev-fda506a

* Fix destination url

* Update vault secrets

* Move bucket path to environment

* Use grafana/grafana-build:dev-2f36afa

* Revert to grafana/grafana-build:main

* Add repo to rgm_main trigger

(cherry picked from commit 971f5f14be)

Co-authored-by: Guilherme Caulada <guilherme.caulada@grafana.com>

scripts/drone/vault.star

@@ -123,12 +123,12 @@ def secrets():
         vault_secret(
             rgm_gcp_key_base64,
             "infra/data/ci/grafana-release-eng/rgm",
-            "gcp_service_account_base64",
+            "gcp_service_account_prod_base64",
         ),
         vault_secret(
             rgm_destination,
             "infra/data/ci/grafana-release-eng/rgm",
-            "destination",
+            "destination_prod",
         ),
         vault_secret(
             rgm_dagger_token,