Reduce time required to run tests

[novocaine]

Why?

Running the full test suite can take up to the order of minutes to complete which negatively impacts our productivity.

What?

We’ll gather performance metrics on test execution time to define and attack reasonable performance goals.

Plan

Tasks

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1. Add slow jest reporter matrix-org/matrix-react-sdk#9599
   T-Task +1
2. Mute console during test matrix-org/matrix-react-sdk#9938
   T-Task +1
3. Use cache for jest matrix-org/matrix-react-sdk#10124
   T-Task +1
4. Kill off enzyme in preference of react testing library matrix-org/matrix-react-sdk#10255
   T-Task +1
   
5. Trying to use knapsackpro matrix-org/matrix-react-sdk#10435
   T-Task +1

• Added a slow reporter which is running on develop
• Removing enzyme in profit of react-testing-library will also improve the execution time
• Muting the console output didn't improve the execution in this PR Mute console during test matrix-org/matrix-react-sdk#9938

Internal references

myhours: https://app.myhours.com/#/projects/2028404/overview

[Johennes]

Closing this off as we've made a few improvements here. Cypress tests are currently the main time consumer and we might get further improvements via https://github.com/vector-im/wat-internal/issues/36.