RN: Fix Configure Automatic Source Maps Upload script for RN 0.81.1 (#15140)

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## DESCRIBE YOUR PR
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This is an iteration over
#14839 fixing the [upload
iOS script for RN
0.81.1+](https://docs.sentry.io/platforms/react-native/manual-setup/manual-setup/).
It also sets the newer version as default.

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Author: antonis

docs/platforms/react-native/manual-setup/manual-setup.mdx

@@ -62,15 +62,16 @@ set -e
 WITH_ENVIRONMENT="../node_modules/react-native/scripts/xcode/with-environment.sh"
 REACT_NATIVE_XCODE="../node_modules/react-native/scripts/react-native-xcode.sh"
 SENTRY_XCODE="../node_modules/@sentry/react-native/scripts/sentry-xcode.sh"
-BUNDLE_REACT_NATIVE="/bin/sh $SENTRY_XCODE $REACT_NATIVE_XCODE"
 
 # RN 0.81.1+
-# /bin/sh -c "$WITH_ENVIRONMENT $BUNDLE_REACT_NATIVE"
+/bin/sh -c "$WITH_ENVIRONMENT /bin/sh $SENTRY_XCODE $REACT_NATIVE_XCODE"
 
 # RN 0.69 - 0.80.0
-/bin/sh -c "$WITH_ENVIRONMENT \"$BUNDLE_REACT_NATIVE\""
+# BUNDLE_REACT_NATIVE="/bin/sh $SENTRY_XCODE $REACT_NATIVE_XCODE"
+# /bin/sh -c "$WITH_ENVIRONMENT \"$BUNDLE_REACT_NATIVE\""
 
 # RN 0.46 – 0.68
+# BUNDLE_REACT_NATIVE="/bin/sh $SENTRY_XCODE $REACT_NATIVE_XCODE"
 # /bin/sh -c "$BUNDLE_REACT_NATIVE"
 ```