🐛(dimail) fix broken auth while resetting passwords

Dimail client's "reset password" method was using basic auth while
dimail expects a token for this endpoint. Fixed it.

src/backend/mailbox_manager/api/client/viewsets.py

@@ -249,6 +249,9 @@ class MailBoxViewSet(
 
     POST /api/<version>/mail-domains/<domain_slug>/mailboxes/<mailbox_id>/enable/
         Send a request to dimail to enable mailbox and change status of the mailbox in our DB
+
+    POST /api/<version>/mail-domains/<domain_slug>/mailboxes/<mailbox_id>/reset/
+        Send a request to mail-provider to reset password.
     """
 
     permission_classes = [permissions.MailBoxPermission]

src/backend/mailbox_manager/tests/api/mailboxes/test_api_mailboxes_reset_password.py

@@ -124,6 +124,12 @@ def test_api_mailboxes__reset_password_admin_successful(role):
     client.force_login(access.user)
     dimail_url = settings.MAIL_PROVISIONING_API_URL
 
+    responses.add(
+        responses.GET,
+        f"{dimail_url}/token/",
+        body=dimail.TOKEN_OK,
+        status=200,
+    )
     responses.add(
         responses.POST,
         f"{dimail_url}/domains/{mail_domain.name}/mailboxes/{mailbox.local_part}/reset_password/",
@@ -169,6 +175,12 @@ def test_api_mailboxes__reset_password_connexion_failed():
     client.force_login(access.user)
 
     dimail_url = settings.MAIL_PROVISIONING_API_URL
+    responses.add(
+        responses.GET,
+        f"{dimail_url}/token/",
+        body=dimail.TOKEN_OK,
+        status=200,
+    )
     responses.add(
         responses.POST,
         f"{dimail_url}/domains/{mail_domain.name}/mailboxes/{mailbox.local_part}/reset_password/",

src/backend/mailbox_manager/utils/dimail.py

@@ -616,7 +616,7 @@ class DimailAPIClient:
         try:
             response = session.post(
                 f"{self.API_URL}/domains/{mailbox.domain.name}/mailboxes/{mailbox.local_part}/reset_password/",
-                headers={"Authorization": f"Basic {self.API_CREDENTIALS}"},
+                headers=self.get_headers(),
                 verify=True,
                 timeout=self.API_TIMEOUT,
             )