Attach user/org information to docs feedback

[lcian]

Problem Statement

Sometimes it would be useful to have information about the user/org that submitted feedback using the feedback form at the bottom of each docs page, so that we can e.g. reach out to them.

Solution Brainstorm

We already fetch this information to e.g. populate code snippets with the user's DSN.
We could either call Sentry.setUser to set the user globally or make an API call just when submitting the feedback and attaching some of the information as tags.

[AbhiPrasad]

I think an issue here is with PII - we'd have to ask legal if we can set user info like this.