Add more known errors to the SSH check (#12326)

Ref:

-
https://read-the-docs.sentry.io/issues/6721034615/events/c4bd08bbaad24af685d07138eda098df/?project=161479
-
https://read-the-docs.sentry.io/issues/6721034615/events/5f3d77782eb747dda25dbbff11524637/?project=161479

Author: stsewd

readthedocs/vcs_support/backends/git.py

@@ -220,6 +220,9 @@ def has_ssh_key_with_write_access(self) -> bool:
                 "ERROR: The repository owner has an IP allow list enabled",
                 # Gitlab:
                 "ERROR: This deploy key does not have write access to this project.",
+                "remote: This deploy key does not have write access to this project.",
+                # Bitbucket:
+                "fatal: Could not read from remote repository.",
             ]
             for pattern in errors_read_access_only:
                 if pattern in stderr: