Strip leading `./` in test mapping spec path

Albert Salimrequested to merge
caalberts-strip-spec-directory into master

What does this MR do?

Strip leading ./ in spec path of test mapping.

This is to ensure that we can intersect this spec path with knapsack's spec path which does not have the leading ./ in https://gitlab.com/gitlab-org/gitlab/blob/48d5af8492d01e33b531d1ff05638f5f03c64681/tooling/lib/tooling/parallel_rspec_runner.rb#L60.

Avoid the need to clean this up when the mapping is downloaded: !48655 (e8786b61)

Edited by Albert Salim

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