Lots of repos are out-of-sync with this styleguide

[benthorner]

There's not much point having a styleguide if we're going to ignore it. For new code, it's seldom absolutely necessary to disable a Cop. It's rarely necessary to disable a Cop for an entire repo.

We should try to address this issue by:

• Removing redundant config e.g. some Metrics/BlockLength overrides
• Removing overrides that can be auto-corrected
• Removing overrides that can be manually corrected fairly easily
• Commenting why any remaining overrides are objectively necessary

Repos this issue applies to:

• smart-answers [4 custom config items]
• specialist-publisher [1 custom config item]
• travel-advice-publisher [5 custom config items]
• special-route-publisher [1 custom config item]
• router-api [3 custom config items]
• maslow [2 custom config items]
• release [1 custom config item]
• support [2 custom config items]
• short-url-manager [2 custom config items]
• search-admin [2 custom config items]
• government-frontend [3 custom config items]
• datagovuk_publish [3 custom config items]
• collections [3 custom config items]
• email-alert-frontend [2 custom config items]
• contacts-admin [1 custom config item]
• frontend [3 custom config items]
• transition [4 custom config items]
• service-manual-publisher [1 custom config item, not using Rails Cops]
• publishing-api [5 custom config items]
• support-api [2 custom config items, not using Rails Cops]
• manuals-frontend [4 custom config items]
• service-manual-frontend [3 custom config items]
• asset-manager [19 custom config items]
• content-data-api [7 custom config items]
• content-store [4 custom config items]
• publisher [6 custom config items]
• search-api [6 custom config items]
• local-links-manager [1 custom config item]
• signon [7 custom config items]
• feedback [3 custom config items]
• content-tagger [10 custom config items]
• email-alert-api [6 custom config items]
• whitehall [18 custom config items]
• content-publisher [4 custom config items]
• licence-finder [1 custom config item]
• calculators [3 custom config items]
• govuk-developer-docs [1 custom config item]
• finder-frontend [1 custom config item]
• collections-publisher [2 custom config items]
• link-checker-api [1 custom config item, not using Rails Cops]
• manuals-publisher [1 custom config items]