chore: Address PR feedback

Author: lqiu96

.github/workflows/dependency_compatibility_test.yaml

@@ -32,10 +32,6 @@ jobs:
       - name: Determine Inputted Dependencies List
         if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.dependencies-list != '' }}
         run: echo "DEPENDENCIES_LIST=${{ github.event.inputs.dependencies-list }}" >> $GITHUB_ENV
-      # Install the modules for the rest of the CI
-      - name: Install sdk-platform-java's modules
-        # gapic-generator-java requires Java 8 and is irrelevant for this CI
-        run: mvn -q -B -ntp install --projects '!gapic-generator-java' -Dcheckstyle.skip -Dfmt.skip -DskipTests -Dclirr.skip -T 1C
 
       # Run in the root module which should test for everything except for showcase
       - name: Perform Dependency Compatibility Testing
@@ -59,6 +55,11 @@ jobs:
           tar -xf showcase-*
           ./gapic-showcase run &
           cd -
+
+      # Install the modules for showcase (Shared-Deps is required to run showcase)
+      - name: Install sdk-platform-java's modules
+        # gapic-generator-java requires Java 8 and is irrelevant for this CI
+        run: mvn -q -B -ntp install --projects '!gapic-generator-java' -Dcheckstyle.skip -Dfmt.skip -DskipTests -Dclirr.skip -T 1C
       # Run specifically for showcase
       - name: Perform Dependency Compatibility Testing (Showcase only)
         shell: bash

dependencies.txt

@@ -3,7 +3,7 @@
 # "1P" refers to First-Party dependencies (owned by Google).
 # "3P" refers to Third-Party dependencies.
 
-# 1P Parent-Pom
+# Pom-Parent Dependencies (https://github.com/googleapis/sdk-platform-java/blob/main/gapic-generator-java-pom-parent/pom.xml)
 javax.annotation-api=1.3.2
 grpc=1.74.0
 google.auth=1.37.1
@@ -17,12 +17,12 @@ j2objc-annotations=3.0.0
 threetenbp=1.7.1
 slf4j=2.0.17
 
-# 1P Shared-Deps
+# 1P Shared-Deps (https://github.com/googleapis/sdk-platform-java/blob/main/java-shared-dependencies/first-party-dependencies/pom.xml)
 grpc-gcp=1.6.1
 google.oauth-client=1.39.0
 google.api-client=2.8.0
 
-# 3P Shared-Deps
+# 3P Shared-Deps (https://github.com/googleapis/sdk-platform-java/blob/main/java-shared-dependencies/third-party-dependencies/pom.xml)
 threeten-extra=1.8.0
 opencensus=0.31.0
 findbugs=3.0.2