Signed-off-by: Aaron Sky <[email protected]>

…2887)

Closes #2886

…2869)

# Background

resolve #2878

# Approach
## As-is

1. Generate App Intents metadata for a target passed to app_intents
(only a single target is supported).
1. Bundle the output from step 1 into the application.

## To-be

### When using Xcode 26 or later

1. Generate App Intents metadata (Metadata.appintents) for each target
passed to app_intents.
1. Generate an additional App Intents metadata file for a dummy
intermediate target by passing the metadata files from `1.` to
`--static-metadata-file-list`.
- `appintentmetadataprocessor` merges the metadata files into a single
metadata.
1. Bundle the output from step 2 into the application.

Note: `appintentmetadataprocessor` supports
`--static-metadata-file-list` starting with the Xcode 26 toolchain.



### Otherwise

Keep the current behavior.

# Sample

sample project


https://github.com/kntkymt/ios-app-intents-sample/tree/main/bazel-multi-app-intents

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Co-authored-by: Aaron Sky <[email protected]>