Trigger: enable flake8

Enable flake8 for the Trigger packages where this was not the case yet. Apply mostly trivial fixes to code. Includes some large tab->space replacements to avoid mixed indentation.

unmarked as a Work In Progress

This merge request affects 33 files. Since this is a long list, I will not print it here.

Adding @sutt ,@nagano ,@kwhalen ,@wiedenma ,@bernius ,@tamartin ,@fwinkl ,@rbielski ,@afaulkne as watchers

added DQ Tau Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash d3035610)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 22504]

added review-approved label and removed review-pending-level-1 label

Changes seem fine, L1 approving.

merged

mentioned in commit ce6ede82

added sweep:ignore label