Use "inputSourceMap" for coverage re-mapping.

[shenjunru]

Summary

Use "inputSourceMap" instead of read from file.
The "babel-plugin-istanbul" can use the input source map from "inputSourceMap" or "inlineSourceMap".
The final source map from babel is not suitable for the coverage re-mapping.
The "istanbul" will ignore the "inputSourceMap", if it already registered.

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[codecov-io]

Codecov Report

Merging #4009 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4009      +/-   ##
==========================================
- Coverage   60.26%   60.22%   -0.05%     
==========================================
  Files         196      196              
  Lines        6765     6770       +5     
  Branches        6        6              
==========================================
  Hits         4077     4077              
- Misses       2685     2690       +5     
  Partials        3        3

Impacted Files	Coverage Δ
...ckages/jest-cli/src/reporters/coverage_reporter.js	47.05% <0%> (-2.95%)	⬇️

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