Feature flag needed for the org write feature

[jeffwilcox]

We've stopped using the org accept invite endpoint of a user's token after hitting a lot of interesting edge cases.

In our latest source, we have a constant shouldAttemptAcceptingInvitations = false value in the code that should probably become a feature flag, or, a call whether to keep it or not.

What's nice when it works:

• Single click join
• Things just work for the user

What's not nice:

• Issues with SAML SSO at times
• Blocked invites issue from GitHub API at times

[github-actions]

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