Show the correct years for stats

[nbradbury]

Fixes #21448

Prior to this PR, "Years and Months" stats incorrectly showed the six earliest years instead of the six most recent. For example:

This PR resolves the problem by showing the six most recent:

To test:

• Select a site that has received traffic for a number of years
• Go to Stats
• Change the filter to Years
• Under Posts & Pages choose a popular post (such as the home page)
• Note that the most recent years are showing
• Scroll down to "Avg views per day" and note the correct years are showing

Note: While working on this I noticed that the "View more" link under "Avg views per day" wasn't working. I tracked that down to this line of code, which explicitly says to do nothing. I'll file a separate issue for that.

[dangermattic]

	1 Warning
:warning:	PR is not assigned to a milestone.

Generated by :no_entry_sign: Danger

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[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	pr21450-f3931b2
	Commit	f3931b25f1236f6e4113837f6bc59dedb8bcb29a
	Direct Download	wordpress-prototype-build-pr21450-f3931b2.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	pr21450-f3931b2
	Commit	f3931b25f1236f6e4113837f6bc59dedb8bcb29a
	Direct Download	jetpack-prototype-build-pr21450-f3931b2.apk

Note: Google Login is not supported on these builds.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 39.50%. Comparing base (ae41f3f) to head (f3931b2). Report is 27 commits behind head on trunk.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #21450 +/- ## ======================================= Coverage 39.50% 39.50% ======================================= Files 2120 2120 Lines 99438 99438 Branches 15282 15282 ======================================= Hits 39281 39281 Misses 56675 56675 Partials 3482 3482 ```

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