[Stats] Add year to date picker for weeks.

[notandyvee]

Fixes #20488

Add year to the week granularity label in datepicker. The screenshot below is on a small screen width.

Note: this affects both the stats that is currently out to everyone and the traffic tab under the week granularity.

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To Test:

• Turn on stats_traffic_tab feature flag in debug settings.
• Go to stats and make sure you are on the traffic tab
• Select the "By Week" granularity.
• You should see a year on the from/to dates.
• Turn off stats_traffic_tab.
• Go back into stats and go to the weeks tab.
• The date picker there should also have the year.

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Regression Notes

1. Potential unintended areas of impact

   This would only affect adding the year to the date picker label on the old stats week granularity.

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

   Manual test.

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.

[wpmobilebot]

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	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20589-6ab59a0
	Commit	6ab59a0
	Direct Download	wordpress-prototype-build-pr20589-6ab59a0.apk

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[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	pr20589-6ab59a0
	Commit	6ab59a0
	Direct Download	jetpack-prototype-build-pr20589-6ab59a0.apk

Note: Google Login is not supported on these builds.

[irfano]

@notandyvee , can we make this change for only the traffic tab by checking stats_traffic_tab flag. The iOS is also doing it this way.
Additionally, I noticed that StatsDateFormatterTest is failing.

[notandyvee]

can we make this change for only the traffic tab by checking stats_traffic_tab flag. The iOS is also doing it this way

That's fine. I'll make the changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.34%. Comparing base (15001b9) to head (6ab59a0).
Report is 98 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #20589   +/-   ##
=======================================
  Coverage   40.34%   40.34%           
=======================================
  Files        1473     1473           
  Lines       67875    67877    +2     
  Branches    11224    11224           
=======================================
+ Hits        27386    27387    +1     
- Misses      38023    38024    +1     
  Partials     2466     2466           

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[notandyvee]

@irfano ready for re-review. Fixed the unit tests and added the feature flag check.

[sonarqubecloud]

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

[irfano]

LGTM! 👍🏻