Run a subset of tests instead of a full suite against every PR. This is an experiment and the purpose of it is to reduce waiting time for CircleCI jobs and avoid running full suite against every commit. More info - p9ugOq-106-p2

Things to consider before we go with it:

• What tests/functionalities we want to cover with canary tests?
• Number of workers? With a smaller number of tests the jobs will wait less time when we have high traffic. But, should we reduce number of workers? Right now it's three.

To test:
Look at the tests in CircleCI jobs. Are they green?
What about execution time? Are they faster than before?

Note:
This option should not go to develop before we add the option to run the full suite against PR.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.