Add Microsoft 365 SCIM bridge and access review driver

Microsoft 365's native SCIM endpoint is unreliable, so mirror the
Google Workspace bridge over Microsoft Graph: a new MICROSOFT_365
OAuth2 connector, a SCIM bridge provider listing /v1.0/users with
$select pagination, and an access review driver that derives admin
status from /directoryRoles members. Refactor the bridge runner to
share OAuth2 plumbing across providers and surface the new bridge
type, scopes, UI card, and bootstrap env wiring.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/connector/registry.go

@@ -136,6 +136,7 @@ var (
 		"TALLY":            "https://api.tally.so/me",
 		"RESEND":           "https://api.resend.com/domains",
 		"ONE_PASSWORD":     "https://events.1password.com/api/v1/auditevents",
+		"MICROSOFT_365":    "https://graph.microsoft.com/v1.0/organization?$top=1",
 	}
 )