[Asset graph] Usability improvements

[salazarm]

Summary & Motivation

Requests from josh:

• Can we rename “Folder view” to “Group view” and use the asset group icon
• On an asset group page is it possible to auto expand the list of asset in the group/folder view? Or maybe this should always just be a list if there is only one group?
• Can we change the default cursor on the graph to be cursor: grab and cursor: grabbing on drag? Hovering over an asset should change it to cursor: pointer
• Fix the alignment of the reload definitions button
• change the placeholder text here from “Search” to “Jump to…”

How I Tested These Changes

locally

[github-actions]

Deploy preview for dagit-core-storybook ready!

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https://salazarm-asset-graph-nits-2.core-storybook.dagster-docs.io

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[github-actions]

Deploy preview for dagit-storybook ready!

✅ Preview
https://dagit-storybook-9a2t9ad4l-elementl.vercel.app
https://salazarm-asset-graph-nits-2.components-storybook.dagster-docs.io

Built with commit fe82478.
This pull request is being automatically deployed with vercel-action