The regression only exercised register_connected_into_current_scope() and
_select_new_servers() directly. Closed#109430 covered the user-visible
path: profile B, driven through the public register_mcp_servers() entry
point, must open its own connection (its own OAuth token) instead of
adopting A's session. Fold that drive into the existing test rather than
adding a second one.
The direct _select_new_servers() assertion is dropped because it marks
B's key as connecting as a side effect, which would make the subsequent
entry-point drive skip the server; the end-to-end drive subsumes it.
kshitijk4poor
527bfe3cc0