Display failure message when adding a APNS with incorrect .p12 key

### How did you install the Amplify CLI?

_No response_

### If applicable, what version of Node.js are you using?

_No response_

### Amplify CLI Version

10.7.1

### What operating system are you using?

Mac

### Did you make any manual changes to the cloud resources managed by Amplify? Please describe the changes made.

none

### Describe the bug

When passing in path to the incorrect p12 key and Amplify CLI fails as expected but with the following error.

```
Failed to enable the APNS channel
```

this does not provide the correct reason for failure. The reason for failure is in the report generated by amplify CLI in the error.json file under the `downstreamException` block containing the `message` key.
For example:


### Expected behavior

Expose the error message on CLI

### Reproduction steps

1. Add notifications
2. select APNS
3. provide an incorrect p12 key
observe error message in CLI and report generated

### Project Identifier

6e0e57ade2748b686ffbd2270e6ba6d1

### Log output

```
# Put your logs below this line

```

### Additional information

_No response_

### Before submitting, please confirm:

- [X] I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.
- [X] I have removed any sensitive information from my code snippets and submission.