[FIX] Requests being skipped after reconnecting on onboarding

[diegolmello]

Proposed changes

We were calling abort on selectServer saga without need.
The app doesn't disconnect if it's reconnecting to the same server, but it would abort upcoming requests anyway.
Calling abort invalidates this.controller from @rocket.chat/sdk https://github.com/RocketChat/Rocket.Chat.js.SDK/blob/mobile/lib/api/api.ts#L260

I wrote a regression test to make sure it doesn't happen again.

Issue(s)

Depends on #4428

How to test or reproduce

• Tap join open
• Go back
• Tap join open again
• From now on, any request happening through @rocket.chat/sdk is going to be aborted

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments