fix(workflows): streamline environment input handling in CI configura…

…tions

- Removed the required environment input from `sub-ci-integration-tests-gcp.yml`.
- Updated comments in `sub-deploy-integration-tests-gcp.yml` to clarify the strategy for creating images in dev and prod environments based on the main branch.

.github/workflows/sub-ci-integration-tests-gcp.yml

@@ -8,9 +8,6 @@ name: Integration Tests on GCP
 on:
   workflow_call:
     inputs:
-      environment:
-        required: true
-        type: string
       network:
         default: "Mainnet"
         type: string

.github/workflows/sub-deploy-integration-tests-gcp.yml

@@ -388,6 +388,8 @@ jobs:
     permissions:
       contents: 'read'
       id-token: 'write'
+    # We want to create images for both dev and prod environments,
+    # but for prod we only want to create images from the main branch
     strategy:
       matrix:
         environment: ${{ github.ref_name == 'main' && fromJSON('["dev", "prod"]') || fromJSON('["dev"]') }}