The compliance page rendered a Slack connector as "Connected" whenever
any SLACK connector existed for the org — including one created for an
access review with no channel configured — and only offered Disconnect,
which deletes the shared connector row.
Distinguish channel-configured connections from unconfigured ones and
let users (re)connect in place to pick a channel without first
disconnecting, reusing the existing reconnect-with-union-scopes flow via
connector_id.
Signed-off-by: Sacha Al Himdani <sacha@probo.com>
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