Cannot create Amplify project with containers in regions with fewer than 3 AZs

### How did you install the Amplify CLI?

npm

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

_No response_

### Amplify CLI Version

12.12.6

### What operating system are you using?

macOS

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

N/A

### Describe the bug

Attempting to create an Amplify project, with containers, in regions with fewer than 3 AZs results in an error: `The requested number of subnets exceeds the number of AZs for the region.` This appears to be because of a hardcoded value for the `subnets` argument to `getEnvironmentNetworkInfo` in [env-level-constructs.ts](https://github.com/aws-amplify/amplify-cli/blob/91436e81f46ad4e8b8251921bfe8307f0cad2952/packages/amplify-provider-awscloudformation/src/utils/env-level-constructs.ts#L78-L83).

### Expected behavior

The number of requested subnets does not exceed the number of availability zones for the selected region.

### Reproduction steps

1. Initialize a new Amplify project in a region with < 3 availability zones (e.g., `us-west-1`)
2. Add container support with `amplify configure projects` > `Advanced: Container-based deployments`
3. Add a containerized API with `amplify add api` > `REST` > `API Gateway + AWS Fargate (Container-based)` > (accept defaults for remaining options)
4. `amplify push -y`

### Project Identifier

0ef4cab727ef3e2dd0a288133a105af9

### Log output

```
2024-08-28T16:29:54.915Z|info : amplify add api
2024-08-28T16:29:54.994Z|info : @aws-amplify/amplify-cli-core.banner-message/index.ts.fetch banner messages from https://aws-amplify.github.io/amplify-cli/banner-message.json({}
2024-08-28T16:30:07.403Z|info : amplify-provider-awscloudformation.system-config-manager.getProfileConfig(["personal"])
2024-08-28T16:30:07.406Z|info : amplify-provider-awscloudformation.system-config-manager.getProfiledAwsConfig.profileConfig([{"credential_process":"","region":"us-west-1"}])
2024-08-28T16:30:12.437Z|info : amplify status core {"yes":false}
2024-08-28T16:30:12.515Z|info : @aws-amplify/amplify-cli-core.banner-message/index.ts.fetch banner messages from https://aws-amplify.github.io/amplify-cli/banner-message.json({}
2024-08-28T16:30:13.758Z|info : amplify-provider-awscloudformation.display-helpful-urls.showCognitoSandBoxMessage(["containeraztest"])
2024-08-28T16:30:23.944Z|info : amplify push core {"yes":true}
2024-08-28T16:30:24.025Z|info : @aws-amplify/amplify-cli-core.banner-message/index.ts.fetch banner messages from https://aws-amplify.github.io/amplify-cli/banner-message.json({}
2024-08-28T16:30:25.443Z|info : amplify-provider-awscloudformation.system-config-manager.getProfileConfig(["personal"])
2024-08-28T16:30:25.446Z|info : amplify-provider-awscloudformation.system-config-manager.getProfiledAwsConfig.profileConfig([{"credential_process":"","region":"us-west-1"}])
2024-08-28T16:30:25.455Z|info : amplify-provider-awscloudformation.zip-util.downloadZip.s3.getFile([{"Key":"[***]rent-[***]ud-[***]d.zip"},null])
2024-08-28T16:30:25.456Z|info : amplify-provider-awscloudformation.aws-s3.s3.getFile([{"Key":"[***]rent-[***]ud-[***]d.zip","Bucket":"[***]ify-[***]aztest-[***]ev-[***]74-[***]ment"}])
2024-08-28T16:30:25.766Z|info : amplify-provider-awscloudformation.initialize-env.run.cfn.updateamplifyMetaFileWithStackOutputs([{"StackName":"[***]ify-[***]aztest-[***]ev-[***]74"}])
2024-08-28T16:30:25.767Z|info : amplify-provider-awscloudformation.system-config-manager.getProfileConfig(["personal"])
2024-08-28T16:30:25.769Z|info : amplify-provider-awscloudformation.system-config-manager.getProfiledAwsConfig.profileConfig([{"credential_process":"","region":"us-west-1"}])
2024-08-28T16:30:25.778Z|info : amplify-provider-awscloudformation.aws-cfn.updateamplifyMetaFileWithStackOutputs.cfn.listStackResources([{"StackName":"[***]ify-[***]aztest-[***]ev-[***]74"}])
2024-08-28T16:30:26.078Z|info : amplify-provider-awscloudformation.aws-cfn.describeStack.cfn.describeStacks([{"StackName":"[***]ify-[***]aztest-[***]ev-[***]74"}])
2024-08-28T16:30:26.363Z|info : amplify-provider-awscloudformation.aws-s3.s3.getFile([{"Key":"[***]ify-[***]json","Bucket":"[***]ify-[***]aztest-[***]ev-[***]74-[***]ment"}])
2024-08-28T16:30:26.811Z|info : amplify-provider-awscloudformation.system-config-manager.getProfileConfig(["personal"])
2024-08-28T16:30:26.812Z|info : amplify-provider-awscloudformation.system-config-manager.getProfiledAwsConfig.profileConfig([{"credential_process":"","region":"us-west-1"}])
2024-08-28T16:30:27.043Z|info : amplify-provider-awscloudformation.system-config-manager.getProfileConfig(["personal"])
2024-08-28T16:30:27.044Z|info : amplify-provider-awscloudformation.system-config-manager.getProfiledAwsConfig.profileConfig([{"credential_process":"","region":"us-west-1"}])
2024-08-28T16:30:27.481Z|error : The requested number of subnets exceeds the number of AZs for the region. {
"subnets": 3,
"azs": 2
}
ConfigurationError: The requested number of subnets exceeds the number of AZs for the region. {
"subnets": 3,
"azs": 2
}
2024-08-28T16:31:39.010Z|info : amplify diagnose core {"send-report":true,"yes":false}
2024-08-28T16:31:39.091Z|info : @aws-amplify/amplify-cli-core.banner-message/index.ts.fetch banner messages from https://aws-amplify.github.io/amplify-cli/banner-message.json({}
```

### 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.

Inspect packages/amplify-provider-awscloudformation/src/utils/env-level-constructs.ts at lines 78–83, especially the getEnvironmentNetworkInfo call. Reproduce the failure with a container-based project in us-west-1, then verify that the requested subnet count does not exceed the region's availability zones and that the reported push scenario succeeds.

Written by the indexing model from the issue text.