Add environment() as bicep parameter file function

**Is your feature request related to a problem? Please describe.**
The Bicep Linter is complaining about a disallowed host that cannot be resolved from the bicepparam file.

**Describe the solution you'd like**
Currently there are 2 functions available in bicepparam files, see https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-functions-parameters-file
I would like to see environment() supported as well to resolve this issue and I can apply the fix that is suggested by the Linter.


Start by reading the bicepparam parameter-file functions documentation and reproducing the Bicep Linter warning for the unresolved host. Compare the existing supported functions with the requested environment() behavior. Done means environment() is accepted in bicepparam files and resolves the host so the disallowed-host warning is addressed.

Written by the indexing model from the issue text.