Generic error modal should include a "Get help" link

[techanvil]

Feature Description

When users encounter the generic error modal we should provide them with a "Get help" link which is handled like others to provide contextually relevant documentation for the error. Otherwise users are stuck retrying (which isn't guaranteed to work) or cancel and give up.

See the related Asana task.

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Acceptance criteria

Implementation Brief

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QA Brief

Changelog entry

[techanvil]

Reviewing this issue, I'm reminded that the omission of a "get help" link was a deliberate choice made during the design phase - we originally had one in the Figma design but it was removed and this was signed off by @marrrmarrr at the time. Here's the relevant thread on Figma.

I'd say this issue can be probably closed as not planned.

@aaemnnosttv, as you raised this during the bug bash I'm assigning it over to you to consider the above.

Cc @ivonac4