Add an overflow menu in Notifications

[jarvislin]

Fixes #20065

This PR contains:

1. An overflow menu icon in Notifications tab.
2. A popup window for Notification actions.
3. Two events added.

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To Test:

1. Open the Jetpack app and switch to the notifications tab.
2. Click the overflow icon on the top-right corner
3. It should show a popup window with two options.

• Mark all as read will be implemented in 🤖 Add Mark all as read functionality #20066.
• Notification Settings is the same as the original behavior.

6. The UI of the popup window should match the new design. (See: yWt5gg3nWORhu079Qfv3mS-fi-51_3817)
7. Switch to the dark/light theme to see the color works in two themes. Known issue: the shadow is not prominent enough in dark mode.
8. Validate new events.
9. Done, thank you!

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Regression Notes

1. Potential unintended areas of impact

   • Notifications tab

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

   • Manual

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

   • None

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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.

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Testing Checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20124-7903409
	Commit	7903409
	Direct Download	wordpress-prototype-build-pr20124-7903409.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20124-7903409
	Commit	7903409
	Direct Download	jetpack-prototype-build-pr20124-7903409.apk

Note: Google Login is not supported on these builds.

[dangermattic]

	1 Warning
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[peril-wordpress-mobile]

	Warnings
⚠️	PR is not assigned to a milestone.

Generated by 🚫 dangerJS

[mkevins]

I tested this on a Pixel 3a (physical device), and it is working as described. I also noted the missing shadow in dark mode, but I agree it is not a blocker for this PR. The code also looks good.

Nice work Jarvis!