chore(e2e): Download modules if cache not found (#6361) (#6371)

(cherry picked from commit 4582761059)

# Conflicts:
#	.github/workflows/enos-run.yml

Co-authored-by: Michael Li <michael.li@hashicorp.com>

.github/workflows/enos-run.yml

@@ -108,6 +108,7 @@ jobs:
           go-version: ${{ inputs.go-version }}
           cache: false
       - name: Set up Go modules cache
+        id: go-mod-cache
         uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
         with:
           path: |
@@ -118,6 +119,10 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go
           fail-on-cache-miss: false
+      - name: Downloads Go modules if cache miss
+        if: steps.go-mod-cache.outputs.cache-hit != 'true'
+        run: |
+          go mod download
       - name: Set up Terraform
         uses: hashicorp/setup-terraform@b9cd54a3c349d3f38e8881555d616ced269862dd    # TSCCR: loading action configs: failed to query HEAD reference: failed to get advertised references: authorization failed
         with: