The endpoints were hardcoded in the application code. This commit aims
at making them overridable with system parameters:
- `microsoft_account.auth_endpoint` defaults to
https://login.microsoftonline.com/common/oauth2/v2.0/authorize
- `microsoft_account.token_endpoint` defaults to
https://login.microsoftonline.com/common/oauth2/v2.0/token
This change allows customers to restrict the tenant the API targets[0].
[0] https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-protocols#endpoints
closes odoo/odoo#62945
Taskid: 2413197
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>