Add ERB linting to the project

[Oaphi]

closes #1699

related: #1655

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.10%. Comparing base (1ab1ddf) to head (5a1d4ba).

⚠️ Current head 5a1d4ba differs from pull request most recent head 56c7a06

Please upload reports for the commit 56c7a06 to get more accurate results.

Additional details and impacted files

Components	Coverage Δ
controllers	76.98% <ø> (ø)
helpers	85.47% <ø> (ø)
jobs	77.43% <ø> (ø)
models	93.25% <ø> (ø)
tasks	61.11% <ø> (ø)
scripts	∅ <ø> (∅)

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[Oaphi]

Had to basically restart the PR in case anyone's wondering what are all those force-pushes about.
We have around ~570 true positives reported. This PR tends to fall behind quickly, so I am changing my approach here - it's going to just sit there and have updates from develop merged in. Any changes actually fixing the reported issues should be made as standalone PRs or as part of working on other issues.

[Oaphi]

Collaboration welcome - if anyone is up to taking on a chunk or two, it'll be appreciated (just avoid simply running autocorrect - I can do that myself just fine, prefer harder problems reported). Please take note of PRs linked here so as not to duplicate work