Empty Stats: Stay on insights tab if Grow Audience card is showing

[momo-ozawa]

Part of #17122

Ref: pbArwn-2NH-p2#comment-3933

Description

This PR updates the Stats selected period behavior.

• Grow Audience card showing -> Insights tab will be shown
• Grow Audience card not showing -> whichever tab the user previously selected will be shown

To test

Site where grow audience card isn't showing

1. Go to My Site > Stats
2. Choose a different stats period, and take note of which period you selected
3. Go back to My Site
4. Go to Stats
5. ✅ The selected stats period should be the same one you selected in step 2

Site where grow audience card is showing

1. Go to My Site > Stats
2. Choose a different stats period (something other than insights)
3. Go back to My Site
4. Go to Stats
5. ✅ The selected stats period should be insights

Regression Notes

1. Potential unintended areas of impact
   Stats selected period (aka tabs)

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Manually tested both scenarios: showing grow audience card vs not showing grow audience card

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 unit tests for my changes.
• 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 an installable build for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

Generated by 🚫 dangerJS

[momo-ozawa]

I'm targeting 18.5 because I think this should ship on the first iteration of Empty Stats. Lmk if this is fine -- otherwise, I can change this to target develop.

[peril-wordpress-mobile]

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

[nikola-milicevic]

LGTM. Works as described.

[mokagio]

@momo-ozawa this has been bundled as part of 18.5 beta 1 (18.5.0.1).

Thanks for your work 🙌