Add list of errors to ignore when parsing for failure reason

[mhdawson]

In the reliability reports we see high counts of "fatal: '/home/iojs/.ccache/node.shared.reference' does not appear to be a git repository" but this is an error that should be ignored and it being reported is hiding whatever the real problem was.

It would be good if we could update the tooling to ignore specific errors like that.

@richardlau pointed to this area in the code as a place to start: https://github.com/nodejs/node-core-utils/blob/main/lib/ci/ci_failure_parser.js