Fix open traffic tab from today's stats card

[irfano]

Fixes #20487

This updates Today's Stats card to have it open "By day" granularity.

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To Test:

Test this with both the stats_traffic_tab enabled and disabled cases:

1. Open "My Site → Stats"
2. Change granularity to something different from "Day".
3. Tap on the "Today's Stats" card from My Site.
4. Verify that it opens the Day granularity in Stats.

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Regression Notes

1. Potential unintended areas of impact

   • Opening Stats from other entry points.

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

   • Tested manually.

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

   • Updated current tests.

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PR Submission Checklist:

• [x] I have completed the Regression Notes.
• [x] I have considered adding accessibility improvements for my changes.
• [x] 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 (strike-out the not-applying and unnecessary ones):

• [ ] ~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)~

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[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	pr20526-7cbb4fb
	Commit	7cbb4fbb49d34771c1e5c543ad61341160834333
	Direct Download	jetpack-prototype-build-pr20526-7cbb4fb.apk

Note: Google Login is not supported on these builds.

[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	pr20526-7cbb4fb
	Commit	7cbb4fbb49d34771c1e5c543ad61341160834333
	Direct Download	wordpress-prototype-build-pr20526-7cbb4fb.apk

Note: Google Login is not supported on these builds.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 40.24%. Comparing base (93d9440) to head (7cbb4fb).

Files	Patch %	Lines
...rdpress/android/ui/stats/refresh/StatsViewModel.kt	50.00%	1 Missing and 2 partials :warning:
...d/ui/stats/refresh/utils/SelectedSectionManager.kt	0.00%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #20526 +/- ## ======================================= Coverage 40.24% 40.24% ======================================= Files 1462 1462 Lines 67592 67592 Branches 11200 11200 ======================================= + Hits 27201 27204 +3 + Misses 37931 37927 -4 - Partials 2460 2461 +1 ```

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