Replace rubocop manual linting with standardrb opinonated linting

[schneems]

Normally wouldn't make so many changes all at once (due to merge conflicts, but there's zero PRs outstanding at the moment so I feel it's a good time to make this switch).

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ActiveRecord::RecordInvalid: Validation failed: State is not included in the list, Number can't be blank issue_id: 86597934, i... Sidekiq/SendDailyTriageEmailJob View Issue
• ‼️ ActiveRecord::RecordInvalid: Validation failed: State is not included in the list, Number can't be blank issue_id: 967764268, ... Sidekiq/SendSingleTriageEmailJob View Issue
• ‼️ ActiveRecord::RecordInvalid: Validation failed: State is not included in the list, Number can't be blank issue_id: 1282073840,... Sidekiq/SendDailyTriageEmailJob View Issue

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