Fix hashFiles to use separate calls for each pattern

GitHub Actions hashFiles() doesn't properly handle multiple comma-separated
patterns in a single call. Split into separate hashFiles() calls:
- hashFiles('**/*.gradle') for Groovy build files
- hashFiles('**/*.gradle.kts') for Kotlin build files

This approach avoids the parsing issues and generates proper cache keys.

Author: hermannakos

.github/workflows/pr-pipeline.yml

@@ -99,7 +99,7 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', '**/gradle-wrapper.properties', '**/gradle.properties', 'apps/buildSrc/src/**/*.kt') }}
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}-${{ hashFiles('**/*.gradle.kts') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
 
@@ -258,7 +258,7 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', '**/gradle-wrapper.properties', '**/gradle.properties', 'apps/buildSrc/src/**/*.kt') }}
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}-${{ hashFiles('**/*.gradle.kts') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
 
@@ -349,7 +349,7 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', '**/gradle-wrapper.properties', '**/gradle.properties', 'apps/buildSrc/src/**/*.kt') }}
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}-${{ hashFiles('**/*.gradle.kts') }}
           restore-keys: |
             ${{ runner.os }}-gradle-