Alternative way to enable fill file path names in scalactic

[saksmt]

Enabling this setting through environment variable isn't always available, so there is alternative way: property.

Example where it is not possible: bazel (and probably other monorepository build tools too)

P.S. Is there a way to backport this to 3.0.x?

[cheeseng]

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[plinlor]

@cla-bot[bot] check

[cla-bot]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Kirill Saksin.
This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email email@example.com
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!