fix: embed watchOS sample frameworks (#8584)

Embed Sentry.framework and SentrySampleShared.framework in the generated watchOS extension.

This prevents the sample from crashing outside Xcode with:

```text
Library not loaded: @rpath/Sentry.framework/Sentry
```

Author: denrase

Samples/watchOS-Swift/watchOS-Swift.yml

@@ -82,7 +82,9 @@ targets:
           - "**/.gitkeep"
     dependencies:
       - target: Sentry/Sentry
+        embed: true
       - target: SentrySampleShared/SentrySampleShared
+        embed: true
     configFiles:
       Debug: Extension/Configurations/watchOS-Swift-Extension.xcconfig
       Release: Extension/Configurations/watchOS-Swift-Extension.xcconfig