Remove whitespace at EOL from ECs

[Flamefire]

First step of enabling flake8 for ECs.

Cmds run:

• flake8 --filename '*.eb' --extend-ignore F821 -j4 --count to find and count issues excluding unknown variables
• flake8 --filename '*.eb' --select W291 -j5 to find only EOL whitespace
• autopep8 -i --select W291 --max-line-length 120 to fix only this issue, in particular: autopep8 -i --select W291 --max-line-length 120 $(flake8 --filename '*.eb' --select W291 -j5 --format='%(path)s' | sort -u)

Note that git diff develop --ignore-space-at-eol turns up empty except for the CI disabling

[Flamefire]

Rebased, conflicts resolved and updated so flake8 --filename '*.eb' --select W291 -j5 turns up nothing.

[Flamefire]

Rebased again, fixed newly introduced issues again.

[Flamefire]

Rebased to include removing recently introduced whitespace and resolve conflicts