eslint (w/ prettier) pre-commit is not checking cypress code

Description

Discovered following investigation that created !29 (merged) :

pre-commit's eslint task is only checking files in src folder. Also npm run lint-ci (and lint-fix) only check src folder too.

We should be checking all code. There are a number of failures with the existing code that should be resolved.

Something else to consider: It may be easier to have a separate prettier check outside the eslint check?

Further details

Current issues with cypress code:

warn   @typescript-eslint/no-unused-vars   'config' is defined but never used.                 .../frontend/cypress/plugins/index.js:1:23
error  @typescript-eslint/no-namespace     ES2015 module syntax is preferred over namespaces.  .../frontend/cypress/support/component.ts:29:3
warn   @typescript-eslint/no-unused-vars   'Subject' is defined but never used.                .../frontend/cypress/support/index.d.ts:2:23
error  @typescript-eslint/no-explicit-any  Unexpected any. Specify a different type.           .../frontend/cypress/support/index.d.ts:7:29
error  @typescript-eslint/no-explicit-any  Unexpected any. Specify a different type.           .../frontend/cypress/support/index.d.ts:7:45
warn   @typescript-eslint/no-unused-vars   'Subject' is defined but never used.                .../frontend/cypress/support/index.d.ts:21:23
error  @typescript-eslint/no-explicit-any  Unexpected any. Specify a different type.           .../frontend/cypress/support/index.d.ts:22:54

Task list

• Ensure cypress code is checked by eslint and prettier in both pre-commit and Gitlab CI

Acceptance criteria

• All source code in this repo is being linted and "prettiered"