test: reproduce "minimal" Jest memory leak

[Jolg42]

Could be related to
ts-jest
kulshekhar/ts-jest#1967
which was reported to jest
jestjs/jest#6814

Another maybe related issue
jestjs/jest#6814

Setup, created a minimal test.ts and duplicated it many times (150 times)

To duplicate the test.ts file:

cd packages/client/src/__tests__/integration/empty-tests-jest
rm test*
seq 150 | xargs -I AAA cp original.ts testAAA.ts

To run

cd packages/client

# for logging of heap to console
PRISMA_CLIENT_ENGINE_TYPE=library node ./node_modules/jest/bin/jest.js --runInBand --logHeapUsage --no-cache empty-tests-jest

# for Chromium inspection at chrome://inspect/#devices
PRISMA_CLIENT_ENGINE_TYPE=library node --inspect-brk --expose-gc ./node_modules/jest/bin/jest.js --runInBand --logHeapUsage --no-cache empty-tests-jest

I used latest v16

node -v
v16.14.0