when trying to retreive application insights key, the reply with connection-string is varied

### Describe the bug

when using `az spring build-service builder buildpack-binding show -n default --resource-group <> --service <> --subscription <>` the json response with the connection-string value is varied. sometimes its connection_string others is connection-string

### Related command

az spring build-service builder buildpack-binding show -n default --resource-group <> --service <> --subscription <>

### Errors

the command doesn't fail, just building anything around the cli or using it via python requires extra checking and validation

### Issue script & Debug output

```
from azure.cli.core import get_default_cli

cli: any = get_default_cli()

cli.invoke(
[
'spring',
'build-service',
'builder',
'buildpack-binding',
'show',
'-n',
'default',
'--resource-group',
'asa-e-rg-01',
'--service',
'asa-e-si-02',
'--subscription',
'5c6097b3-0798-4146-8d81-1e3ef0686c2d'
]
)

print(cli.result.result)
data = cli.result.result
print(data['properties']['launchProperties']['properties']['connection_string'])
```

### Expected behavior

to not fail, or have a the keys be the same and not change from _ to - as a sperator

### Environment Summary

az cli 2.51
account | 0.2.5
application-insights | 0.1.19
serviceconnector-passwordless | 0.3.8
spring | 1.14.0

### Additional context

_No response_