batches: fix regression in workspaces preview
Created by: courier-new
There was a regression with the overflow scroll behavior of the workspaces preview when <Resizable /> was migrated to <Panel />, which I fixed in https://github.com/sourcegraph/sourcegraph/pull/34252. However I didn't fix it quite right.
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This restores the original intended behavior, where just the list of workspaces is scrollable. It also fixes a separate regression with the width of the list shifting abruptly after a new resolution preview response comes back.
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Test plan
Manually verified changes with a sufficiently long list of workspaces in the preview to create the scroll. This page will get storybook coverage in an upcoming PR.
App preview:
Check out the client app preview documentation to learn more.