Switch "number of samples" to "number of donors"

[OrdiNeu]

Description

• The "Complete Genomic" graph in both the summary page and completeness stats page has an x axis of "samples" instead of donors

Screenshots (if appropriate)

After PR

Types of Change(s)

• 🪲 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)

Has it been tested for:

• My change requires a change to the documentation
• I have updated the documentation accordingly
• Prettier linter doesn't return errors
• Production branch PR browser testing: Chrome, Firefox, Edge, etc.
• Locally tested
• Dev server tested
• Production tested when merging into stable/production branch
• Runbook tasks pass locally/on UHN-Dev
• If visuals have changed, Runbook has been updated with new screenshots

[OrdiNeu]

Close in favor of #140