Improve ORCID + HTTP URL validators

[fbacall]

Summary of changes

• Validate ORCID is actually a valid ID (using checkbit).
• Don't validate ORCID by checking URL is accessible.
• Safer HTTP URL validation.
• Fix WebMock registry not being cleared between tests, leading to test slowdown.
• Add minitest-reporters to catch slow tests.

Motivation and context

• ORCID validation was randomly failing after an unrelated change: https://github.com/ElixirTeSS/TeSS/actions/runs/5940521282/job/16109276821#step:9:33 (ActiveRecord::RecordInvalid: Validation failed: Profile orcid is not accessible test/models/user_test.rb:303')
• HTTP URL validator would check against private addresses.
• Noticed test suite runs were taking longer than previously.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.