[buildbot] Support a list of regex when matching builds to changed files

Summary:
This will be necessary to limit node-related tests to not run when
only files changed for specific projects (such as the buildbot). Updates
to those build configs will come in a later patch.

Depends on D8471

Test Plan:

pytest

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D8472