Revert "[Dialog] Replace deprecated Button for current one"

[siddharthkp]

• Reverts [Dialog] Replace deprecated Button for current one #3084
• Re-open Focus not appearing on non-standard dialog button (re-opened after revert) #3062

Sorry @ItzaMi, @broccolinisoup, had to revert this PR because it failed the integration tests in github/github

Issues found:

1. (link is github staff only) ui/packages/memex/src/client/pages/insights/components/insights-upsell-dialog.tsx:66 uses Button as="a", the types for which are not supported

   Reported in https://github.com/github/github/actions/runs/5573804589/jobs/10181608881:

   ui/packages/memex/src/client/pages/insights/components/insights-upsell-dialog.tsx(66,11): 
   error TS2322: Type '{ as: string; buttonType: "primary"; content: JSX.Element; href: string; sx: { ml: number; }; target: string; rel: string; onClick: () => void; }' is not assignable to type 'DialogButtonProps'.
   

2. Checking the storybook for the pull request, it looks like the focus bug was not fixed

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Latest commit: 1c26a20

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	102.64 KB (+0.49% 🔺)
dist/browser.umd.js	103.2 KB (+0.5% 🔺)

[broccolinisoup]

Ah such a bummer 😭 But thanks for catching the breaking issue! We will look at it to re-introducing it again.