remove source-xero from Cloud

[evantahler]

From slack

source-xero has been hidden from cloud for over a month as it is having oAuth issues. This makes it explicit that the connector is no longer available on cloud (docs, etc).

This will remove xero from the registry, but allow existing users to keep using the actors they have (the LaunchDarkly feature flag to hide Zero should remain enabled)

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
airbyte-docs	⬜️ Ignored (Inspect)		Nov 13, 2023 10:37pm

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[pedroslopez]

As long as we keep it hidden w/ the feature flag, LGTM!

[evantahler]

/approve-and-merge reason="tests don't matter, removing connector from cloud"

[octavia-approvington]

Jerry would be proud