Draft: Add Flake8 linting to the CI in 2018-patches

Nate Grieserrequested to merge
flake8CI-2018-patches into 2018-patches

Add flake8 linting to the CI for the 2018-patches branch.

Work towards DPA task https://gitlab.cern.ch/lhcb-dpa/project/-/issues/246.

Edited by Eduardo Rodrigues

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