azd provision fails to retrieve environment name

[NanaXiong00]

Describe the issue:
Unable to correctly retrieve the environment name using azd provision, as shown below:

Repro Steps:

1. Open in GitHub Codespaces.
2. Run python -m venv .venv and source .venv/bin/activate.
3. Run pip install -r requirements.txt.
4. Run azd auth login.
5. Run npm i.
6. Run npm run env:init.
7. Run azd provision.

Environment:

• Azd version: azd version 1.9.6 (commit 0b1a8ad350177078312141f4465ad72205d7c077)
• OS: Codespaces, Dev Containers.

Expected behavior:
azd provision can correctly retrieve the environment name.

@hemarina and @cwaddingham for notification.

[vhvb1989]

Add a mapping for environmentName in parameters.json like

 "environmentName": {
      "value": "${AZURE_ENV_NAME}"
    },

Suggested PR: #14