Error message about using --force argument for decompile doesn't work from az CLI

1) create arm template main.json:
```json
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {},
"functions": [],
"variables": {},
"resources": [],
"outputs": {}
}
```
2) az bicep decompile -f main.json
3) do it again: az bicep decompile -f main.json
4)
```
The output path "/Users/stephenweatherford/repos/template-examples/ttk/artifacts-parameter/pass/raw-repo-path/main.bicep" already exists. Use --force to overwrite the existing file.
```
Unfortunately for az bicep there is no --force option. Does it need to be added? Is this a powershell issue as well?

Reproduce the issue with the two `az bicep decompile -f main.json` commands described in the report and start from the Azure CLI `bicep decompile` entry point. Trace where the existing-output error is generated and determine whether the CLI should accept `--force` or change the message; done when the repeated command has consistent, documented behavior and coverage.

Written by the indexing model from the issue text.