Add more app information to the error info page

[rowanmanning]

The error info page could include more information to help an engineer debug local issues.

What problem does this feature solve?

There's still some information we could provide which an engineer will currently have to get from elsewhere if they see an error.

Ideal solution

We add the following info to new sections of the error info page (as well as any other fields we agree on as part of this issue):

• Commit hash/name? (though it could be a dirty working tree so maybe not useful)
• Git branch name
• Node.js version
• Feature flag states
• User licenses? (though reliably getting user information might be tough)

Some of these rely on running git commands from Node.js which could potentially be error-prone so we’ll need to be smart about handling failures.

Alternatives

• Do nothing as we haven't been asked about this by a Reliability Kit user yet.

• Add each of these fields as-and-when they're useful rather than in one big PR.

See also

CPREL-273