chore: add missing ACCOUNT_PROFILE_URL setting to the Account MFE

This PR adds the `ACCOUNT_PROFILE_URL` setting to the `.env` and `.env.development` settings files
in order to make it easier to configure the communication between the Profile and Account MFEs in
Open edX development environments.

.env

@@ -1,4 +1,5 @@
 ACCESS_TOKEN_COOKIE_NAME=''
+ACCOUNT_PROFILE_URL=''
 BASE_URL=''
 CREDENTIALS_BASE_URL=''
 CSRF_TOKEN_API_PATH=''

.env.development

@@ -1,4 +1,5 @@
 ACCESS_TOKEN_COOKIE_NAME='edx-jwt-cookie-header-payload'
+ACCOUNT_PROFILE_URL='http://localhost:1995'
 BASE_URL='localhost:1997'
 CREDENTIALS_BASE_URL='http://localhost:18150'
 CSRF_TOKEN_API_PATH='/csrf/api/v1/token'