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fix: Drop coverage produced by `nyc --all` for files that were tested (#1155)

* fix: Drop coverage produced by `nyc --all` for files that were tested

Sometimes the coverage data produced by `nyc --all` is incompatible with
the coverage data produced by actual test runs.  This is generally due
to configuration error but results in inconsistent coverage reports or
in some cases causes `nyc report` to crash.  The workaround is
implemented in istanbul-lib-coverage to drop coverage data associated
with `nyc --all` when coverage data from a test run is found.  This
commit tags the coverage data when appropriate so the coverage merge
logic knows what to do.

Fixes #1113, #1124, #1148

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