feat(testing): Configure jest to ignore sidecar files in __tests__ folder

[V1shvesh]

Solves for #10870

Description:

./api directory structure:

./web directory structure:

Before:

yarn rw test api:

yarn rw test web:

After:
yarn rw test api:

yarn rw test web:

[V1shvesh]

@cannikin please have a look, I added config to ignore sidecar files in the web directory as well!

[ahaywood]

Hey @V1shvesh Thanks for taking the time to do this! We'll take a look.

[dac09]

Thanks @V1shvesh, looks good!

[cannikin]

Thanks so much for this, works perfectly!