[SERVER-1793] - Expanding Reality Check

[circlery]

Summary

Expands reality check by adding in a third required environment variable CIRCLE_CLOUD_PROVIDER which runs android machine jobs in GCP, and ARM machine jobs in AWS environments.

Other Changes

• Rewrites readme
• Adds a screenshot of a successful run in a GCP environment

Updating Existing Reality Checks

The new AWS and GCP workflows will fail in existing reality check installations until the CIRCLE_CLOUD_PROVIDER project environment variable is set; this is indicated in the job failure message.

[soulchips]

@circlery this is gonna fail till you add the variable to the project in cloud. You may need to speak with RE on this
cc/ @yugesh84

[yugesh84]

@circlery this is gonna fail till you add the variable to the project in cloud. You may need to speak with RE on this cc/ @yugesh84

So, we don't directly use this realitycheck in any of our pipelines. We use a GHE flavor in all of our CI, and for the k9s job, a fork of this repo.
There should be a separate card (if you want this in CI) so RE can work with y'all to propagate these changes everywhere.

Also, as this is used for 2.x installs also, these new jobs might break for customers that try to run this in 2.x. Is this something that is a concern to us? Maybe not, but just want to ensure that it's been discussed.

[circlery]

Created a tag for anyone who may be using 2.x/3.x and hasn't yet forked this repository.
https://github.com/circleci/realitycheck/releases/tag/server-2-3

Will merge for all 4.x installations.