Adds additional units and route to prescriptions

[cu8code]

Required Backends

• https://github.com/coronasafe/care/pull/2290

Proposed Changes

• Fixes #8059
• In dosage units dropdown added "mcg" and "unit(s)" units
• In routes added "Sublingual"

@coronasafe/care-fe-code-reviewers @coronasafe/code-reviewers

Merge Checklist

• [ ] Add specs that demonstrate bug / test a new feature.
• [ ] Update product documentation.
• [ ] Ensure that UI text is kept in I18n files.
• [ ] Prep screenshot or demo video for changelog entry, and attach it to issue.
• [ ] Request for Peer Reviews
• [ ] Completion of QA