editor: To not scroll if all selections can't fit on screen

[anirudh1713]

Closes #32894

TODO

• Confirm is something similar needs to be fixed for horizontal scroll as well

Release Notes:

• Fixed an issue where autoscroll fit strategy was falling back to autoscroll newest when all selection can't fit on screen

[zed-industries-bot]

	Warnings
⚠️	editor: to not scroll if all selections can't fit on screen ^ Write PR titles using sentence case.

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[anirudh1713]

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[anirudh1713]

Context on the changes: #32894 (comment)

To add to this, I've update the existing test as it was contradictory. I'm not sure what the test was targeting so I think someone with more context can verify if its ok to modify this behavior.

Another approach that comes to mind is to have an explicit (optional) fallback strategy that consumer of enum can pass. e.g. with autoscroll fit, you may optionally pass autoscroll newest as a fallback 🤔