Endpoint URL construction incorrect when running inside of Local Zone

### Describe the bug

The aws-cli builds/returns the wrong endpoint when running on a host in a Local Zone.
ex.: https://sts.us-west-2-den-1.amazonaws.com/

### Expected Behavior

The aws-cli should correctly build endpoints to the Local Zones parent region
ex.: https://sts.us-west-2.amazonaws.com/

### Current Behavior

```
# /usr/local/bin/aws --version
aws-cli/2.7.7 Python/3.9.11 Linux/5.4.196-108.356.amzn2.x86_64 exe/x86_64.amzn.2 prompt/off

# /usr/local/bin/aws configure list
Name Value Type Location
---- ----- ---- --------
profile None None
access_key ****************UMSL iam-role
secret_key ****************OtzT iam-role
region us-west-2-den-1 imds

# /usr/local/bin/aws sts get-caller-identity

Could not connect to the endpoint URL: "https://sts.us-west-2-den-1.amazonaws.com/"
```

### Reproduction Steps

```
# /usr/local/bin/aws --version
aws-cli/2.7.7 Python/3.9.11 Linux/5.4.196-108.356.amzn2.x86_64 exe/x86_64.amzn.2 prompt/off

# /usr/local/bin/aws configure list
Name Value Type Location
---- ----- ---- --------
profile None None
access_key ****************UMSL iam-role
secret_key ****************OtzT iam-role
region us-west-2-den-1 imds

# /usr/local/bin/aws sts get-caller-identity

Could not connect to the endpoint URL: "https://sts.us-west-2-den-1.amazonaws.com/"
```

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CLI version used

2.7.7

### Environment details (OS name and version, etc.)

Amazon Linux 2