chore: remove depot (#10343)

# Which Problems Are Solved

We hit a rate limit for our current plan at Depot
https://github.com/zitadel/zitadel/actions/runs/16589101600/job/46920267954?pr=10342.

# How the Problems Are Solved

Let's remove Depot for now, make things work and then optimize with
caching.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/workflows/build.yml

@@ -54,8 +54,6 @@ jobs:
       console_cache_path: ${{ needs.console.outputs.cache_path }}
       version: ${{ needs.version.outputs.version }}
       node_version: "20"
-    secrets:
-      DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
 
   core-unit-test:
     needs: core
@@ -103,8 +101,6 @@ jobs:
     with:
       login_build_image_name: "ghcr.io/zitadel/zitadel-login-build"
       node_version: "20"
-    secrets:
-      DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
 
   e2e:
     uses: ./.github/workflows/e2e.yml