Remove abspath.

[ksaaskil]

• Service core contains a field absPath that was probably earlier used for dereferencing references from OpenAPI specs, in the case where those references pointed to file system.
• It's apparently not used anymore so delete it, this also removes a reference to process.cwd() that breaks in browser

[codecov-io]

Codecov Report

Merging #353 into dev will decrease coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #353      +/-   ##
==========================================
- Coverage   81.06%   81.05%   -0.01%     
==========================================
  Files          53       53              
  Lines        2361     2360       -1     
  Branches      577      576       -1     
==========================================
- Hits         1914     1913       -1     
  Misses        447      447

Impacted Files	Coverage Δ
packages/unmock-core/src/parser.ts	92.3% <ø> (ø)	:arrow_up:
packages/unmock-core/src/service/serviceCore.ts	95% <100%> (-0.09%)	:arrow_down:

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