fix(ios): print bundler output line-by-line on build failure (#5699)

When a JS syntax or import error causes the Metro bundler to fail,
the build output was printed as a single unreadable string, hiding
the actual error behind a generic Sentry source maps message.

Print the captured output line-by-line (consistent with the success
path) and before the Sentry guidance, so the real bundler error is
visible in Xcode's Issues navigator.

Fixes #5689

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: antonis

packages/core/scripts/sentry-xcode.sh

@@ -57,11 +57,11 @@ if [ "$SENTRY_DISABLE_AUTO_UPLOAD" != true ]; then
     echo "$SENTRY_XCODE_COMMAND_OUTPUT" | awk '{print "output: sentry-cli - " $0}'
   else
     if [ "$SENTRY_ALLOW_FAILURE" == true ]; then
+      echo "$SENTRY_XCODE_COMMAND_OUTPUT" | awk '{print "warning: sentry-cli - " $0}'
       echo "warning: sentry-cli - Source maps upload failed, but continuing build because SENTRY_ALLOW_FAILURE=true"
-      echo "warning: sentry-cli - $SENTRY_XCODE_COMMAND_OUTPUT"
     else
+      echo "$SENTRY_XCODE_COMMAND_OUTPUT" | awk '{print "error: sentry-cli - " $0}'
       echo "error: sentry-cli - To disable source maps auto upload, set SENTRY_DISABLE_AUTO_UPLOAD=true in your environment variables. Or to allow failing upload, set SENTRY_ALLOW_FAILURE=true"
-      echo "error: sentry-cli - $SENTRY_XCODE_COMMAND_OUTPUT"
       exitCode=1
     fi
   fi