Addresses lint issues in AGP 7.2.1 update

[oguzkocer]

This PR addresses the lint issues due to AGP 7.2.1 update in #16834.

• 84598d0 removes the unused TextDrawable widget, so we don't even need to fix the lint issue 🙈
• d1eeb1e removes the custom divider and uses the built in DividerItemDecoration instead. Funnily enough I worked on the people list 6+ years ago and DividerItemDecoration was not available back then (was added a few months after) so we had to build it ourselves. The difference between the regular divider and the custom divider is that the regular divider covers the whole width whereas the custom divider had some space before and after the line. See the screenshots below for comparison. Since we are using the regular divider in a lot of newer screens, this change should bring the design of people list closer to the rest of the app so it's a win-win situation.
• 9988ff8 addresses Obsolete SDK_INT version checks lint error.

Before:

(Full name and display name are removed and the screenshot was cut in half to make it easier to see)

After:

(Full name and display name are removed and the screenshot was cut in half to make it easier to see)

To test:

• Smoke test the app
• Checkout the People page from "My Site" -> "People" and verify that the divider looks OK

Regression Notes

1. Potential unintended areas of impact
   N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   N/A

3. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[wpmobilebot]

You can test the WordPress changes on this Pull Request by downloading an installable build (wordpress-installable-build-pr16839-0e12fd6.apk), or scanning this QR code:

[wpmobilebot]

You can test the Jetpack changes on this Pull Request by downloading an installable build (jetpack-installable-build-pr16839-0e12fd6.apk), or scanning this QR code:

[ParaskP7]

👋 @oguzkocer !

I have reviewed and tested this PR as per the instructions, everything works as expected, good job! 🌟

---

I have left one suggestion (💡) for you to consider. I am going to approve this PR anyway, since none is blocking. I am NOT going to merge this PR yet to give you some time to apply any of my suggestions. However, feel free to ignore them and merge the PR yourself.

[ParaskP7]

Funnily enough I worked on the people list 6+ years ago and DividerItemDecoration was not available back then (was added a few months after) so we had to build it ourselves.

1. It feels nice to replace code you've written in the past with a much simpler version of it, isn't it! 😄
2. I find awesome the fact that you keep working and applying love to a codebase for more than 6 years now, kudos! ❤️

[peril-wordpress-mobile]

	Warnings
⚠️	PR has more than 300 lines of code changing. Consider splitting into smaller PRs if possible.

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