Repro sample app for Azure/azure-dev#4706

Repro steps

1. Create a Key Vault and a secret in it. Make sure enabledForTemplateDeployment on the key vault is set to true (more info)

2. Update infra/main.parameters.json and infra/main.bicepparam with the Key Vault and secret information.

3. To test with JSON parameter file, rename infra/main.bicepparam to infra/main.bicepparam.tmp and infra/main.parameters.json.tmp to infra/main.parameters.json.

   To test with Bicep parameter file, rename infra/main.parameters.json to infra/main.parameters.json.tmp and infra/main.bicepparam.tmp to infra/main.bicepparam.

4. azd up