Add (budget and audiences) tracking for Onboarding completed with Ads

[puntope]

Changes proposed in this Pull Request:

This is a continuation for #2153

This PR adds the Tracking events with the budget and the audience when the onboarding is completed adding Ads.

• It only adds Budget and Audiences

Screenshots:

Detailed test instructions:

1. Enable tracks debugger --> Add this to yourBrowser console --> localStorage.setItem( 'debug', 'wc-admin:*' )
2. Start a fresh Onboarding
3. In the final step connect Ads and create a campaign
4. Set a budget
5. Complete the setup
6. See the track event with the budget and the audiences.

Additional details:

Changelog entry

Tweak - Track Budgets and Audience in Onboarding

[eason9487]

Thanks for the work.

There are questions about the call timing of event tracking and whether to merge event tracking. I think they need to be clarified first.

[eason9487]

Just noticed another thing. Event tracking also involves extension users. Should it belong to the changelog: dev category?

[puntope]

Howdy @eason9487 Thanks for reviewing this.

I applied your suggestion as it fixes the race problem and reuses the gla_onboarding_complete_with_paid_ads_button_click existing event so now it should be consistent.

I updated also from changelog:dev to changelog:tweak

Can you help with a new round of reviews?

[eason9487]

Thanks for the adjustment.

It still needs a bit of tweak as the initial paidAds.countryCodes is undefined.

[puntope]

Hi @eason9487 thanks again for the review and for the catch.

Sorry. I saw that error yesterday and forgot to push it 😵‍💫

Can you do a new round? Thanks.

[eason9487]

LGTM