TableView cosmetic fixes from testing session

[snowystinger]

Closes
allows resizing, header cell button has a 2px focus ring around it, except the top is only 1px it looks like (RS)
allowsResizing, column divider is offset by .5px with resizer (DG)
focus ring width is shortened by width of resizer. looks esp weird with dividers (DG)
The divider sticks out a bit above the resizer nubbin. See screenshot row 6 (DL)

Also included List/Menu Section fix
Section Titles seem a bit too close to the divider with too much trailing whitespace? Note, this spacing didn't change, but perhaps is more noticeable with descenders? (RS)

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[adobe-bot]

Build successful! 🎉

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[reidbarber]

LGTM, all fixes work as described.

[adobe-bot]

Build successful! 🎉

• View the storybook
• View the storybook-17
• View the storybook-16
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