Free Listings + Paid Ads: Add event tracking

[eason9487]

Changes proposed in this Pull Request:

This PR implements the 📌 Event tracking in #1610.

• Add event trackings for the buttons in the last step of onboarding flow

Detailed test instructions:

1. Enable event tracking logging by running localStorage.setItem( 'debug', 'wc-admin:*' ) in the Console tab of DevTool, and refresh page to make it effective.
2. Go to step 4 of onboarding flow.
3. Test the four buttons that are marked as A, B, C, D in the screenshots of Event tracking.
4. Check if the event names and their properties are the same as the requirements.

Changelog entry

[puntope]

❓ Tracking in C and D worked for me. However after I created the Ads setup... I was not able to see again the A, B buttons (even I deleted all %gla% options as well as disconnected accounts.

[puntope]

⚠️ Another issue I found here thats seems to be unrelated with this PR... is about Phone number.

Steps:

• Verify the phone number
• Click continue and go to last step
• Click back in the top navigation
• Phone number cards shows still and editable and continue button disabled

Screen.Recording.2022-09-22.at.11.03.08.mov

[eason9487]

@puntope, thank you for the code review.

❓ Tracking in C and D worked for me. However after I created the Ads setup... I was not able to see again the A, B buttons (even I deleted all %gla% options as well as disconnected accounts.

Once a merchant continues with the paid ads settings, the showPaidAdsSetup state will be stored in sessionStorage. I thought merchants almost won't do these things with the same browser tab: Complete the onboarding, disconnect all accounts, and then restart onboarding again. Even though this use case happens, it won't make the onboarding flow unworkable, thus I didn't clear the state from sessionStorage.

⚠️ Another issue I found here thats seems to be unrelated with this PR... is about Phone number. [...]

I believe it relates to #1033, and that missing implementation became looks like a bug after adding a new step behind the content info step.

[puntope]

✅ LGTM

Tested locally and my questions were clarified

✅ Clicking on Setup Ads and then in Skip without configure/connect the Ads

✅ Clicking on Setup Ads and then in Skip after connecting the Ads Account

✅ Click on Skip

✅ Complete the Ads Setup and Click on Complete