Remove deprecated workspace and scheme files from Contentstack project

- Deleted the contents.xcworkspacedata file from Contentstack.xcodeproj.
- Removed IDEWorkspaceChecks.plist and WorkspaceSettings.xcsettings from xcshareddata.
- Eliminated all xcscheme files related to iOS, macOS, tvOS, and watchOS tests.
- Created new workspace and scheme files for ContentstackSwift project.

Author: reeshika-h

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
     - name: Build and run tests
       run: |
         xcodebuild test \
-          -workspace Contentstack.xcworkspace \
+          -workspace ContentstackSwift.xcworkspace \
           -scheme "Contentstack macOS Tests" \
           -destination 'platform=macOS,arch=arm64' \
           ONLY_ACTIVE_ARCH=NO \
@@ -90,7 +90,7 @@ jobs:
     - name: Build and run tests
       run: |
         xcodebuild test \
-          -workspace Contentstack.xcworkspace \
+          -workspace ContentstackSwift.xcworkspace \
           -scheme "Contentstack iOS Tests" \
           -destination 'platform=iOS Simulator,name=iPhone 15,OS=17.2' \
           -sdk iphonesimulator \