Revert "Adds aria-expanded="false" back to AnchoredOverlay"

[siddharthkp]

• Reverts Adds aria-expanded="false" back to AnchoredOverlay #4394
• Found integration tests failing because of this change

The failures are of 2 kinds:

1. failing storybook axe tests: (example) These errors are related to incorrect usage. There are some triggers that are not buttons, adding an aria-expanded to them leads to axe errors. We need to fix the incorrect usage first.
2. failing jest tests: (example) There are tests that expect aria-expanded to be undefined instead of false. We need to update these tests in a branch that we can merge into the integration branch

Next steps:

1. After this PR is merged, please revert this pull request to bring back your changes in a new PR.
2. Mark as ready to review once you have tested with dotcom

How to we avoid reverts like this in the future?

Follow this guide to run integration tests for your pull request in dotcom: https://github.com/github/primer-engineering/blob/main/how-we-work/testing-primer-react-pr-at-dotcom.md

[changeset-bot]

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Latest commit: 3228b7a

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	88.97 KB (+0.03% 🔺)
packages/react/dist/browser.umd.js	89.25 KB (-0.04% 🔽)