Disable type-checking in ts-jest.

[ksaaskil]

Tests fail quite randomly with the following kind of output:

FAIL  packages/unmock/src/__tests__/end-to-end/simple-service.test.ts
  ● Test suite failed to run

    TypeError: Unable to require `.d.ts` file.
    This is usually the result of a faulty configuration or import. Make sure there is a `.js`, `.json` or another executable extension available alongside `interfaces.ts`.

In this thread, the given solution is to disable type-checking in ts-jest by setting isolatedModules parameter to true. This should be fine in our case as we run separate type-checking in the build pipeline.

[codecov-io]

Codecov Report

Merging #352 into dev will increase coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #352      +/-   ##
==========================================
+ Coverage   80.95%   81.06%   +0.11%     
==========================================
  Files          52       53       +1     
  Lines        2347     2361      +14     
  Branches      577      577              
==========================================
+ Hits         1900     1914      +14     
  Misses        447      447

Impacted Files	Coverage Δ
packages/unmock-core/src/service/index.ts	100% <0%> (ø)	:arrow_up:
packages/unmock-core/src/types.ts	100% <0%> (ø)
...kages/unmock-node/src/loggers/snapshotter/index.ts	85.48% <0%> (+0.23%)	:arrow_up:
packages/unmock-core/src/service/spy/index.ts	94.73% <0%> (+0.29%)	:arrow_up:
packages/unmock-core/src/index.ts	85% <0%> (+0.51%)	:arrow_up:

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