feat(auth): implement cloudflare turnstile on login page

[makors]

Proposed changes

• Adds a Cloudflare Turnstile widget to the login/auth form with proper validation checks
• CSS/JS changes for functionality and to allow for the Turnstile widget to fit if it's visible (typically invisible, sometimes visible. see managed mode)
• Adds tests for the CAPTCHA solution and updates current ones accordingly with cases for enabled and disabled CAPTCHAs

Brief description of rationale

This increases the cost of brute forcing Ion with logins (bypassing IP rate limiting is menial) with CAPTCHAs in addition to the current login security measures.

Replaces #1873 , closes #1758

[makors]

The format of commit c27350defd is invalid:
* First line does not match format
* First letter in commit message description is not lowercase.

CONVENTIONAL COMMITS ARE A CONSPIRACY, GIT ANARCHY IS PREFERRED

[makors]

Well good thing I wrote tests

[coveralls]

coverage: 79.256% (-0.008%) from 79.264% — makors:turnstile-squashed into tjcsl:dev