Cannot remove encrypted fields during edit

[travjenkins]

Blocked by

estuary/connectors#2326
Once this is done we can close this issue

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Bug
User creates and entity
Provides secure values into endpoint config
User edits entity
User uses x button to clear secure values
User Saves
Value still there

Expected
The value should remove.

Screenshots
N/A

Desktop (please complete the following information):
N/A

Additional context
More than likely this is because encrypted fields are mark as allowed to be blank. I think this is causing the issue here. We might want to look at updating the clear button to no longer set the string to "" but make it undefined or something. Not totally sure yet.

[travjenkins]

This is very complex to implement in the UI and to build out the UX. Going to make the change on the connector side and no longer allow secrets to be nullable.

[travjenkins]

Adding details to the docs https://github.com/estuary/connectors/pull/2327/files