Simplify and enhance the loading state control during the Google Ads account creation and claiming

[eason9487]

Changes proposed in this Pull Request:

It's a pre-processing PR for event tracking to be added for #2215. In this way, the position and timing of adding event tracking could be made more explicit.

• Simplify the loading state control during the Google Ads account creation and claiming.
  • The reason for removing the "Waiting…" state is that once the user closes all pop-up windows, there is no button to open the invitation window again from the onboarding page unless they refresh the webpage.
• Parallel fetches Google Ads account and its status in the useUpsertAdsAccount hook to reduce the waiting time a bit.
• Disable the "Or, use your existing Google Ads account" button while upserting Google Ads account.
  

Screenshots:

Kapture.2024-05-27.at.17.53.59.mp4

Detailed test instructions:

1. Disconnect Google Ads account if there is a connected one.
2. Go to step 1 of the onboarding flow.
3. Connect a Google Merchant Center account first.
4. Create a new Google Ads account and claim it.
5. During Google Ads account creation and claiming, inspect the loading state to see if it's correct and not flashing other unexpected stuff.
6. Make sure it doesn't have issues like the following video:
   1. The "Or, use your existing Google Ads account" button is enabled while upserting Google Ads account.
   2. There is no way to open the pop-up window again from the page after closing the pop-up window opened by clicking on the "Claim Account"

Kapture.2024-05-27.at.18.02.05.mp4

Changelog entry

[codecov]

Codecov Report

Attention: Patch coverage is 57.89474% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 61.8%. Comparing base (6e54e69) to head (b62983b).

Additional details and impacted files

@@                        Coverage Diff                         @@
##             tweak/retry-get-merchant-link   #2413      +/-   ##
==================================================================
- Coverage                             64.6%   61.8%    -2.7%     
==================================================================
  Files                                  459     319     -140     
  Lines                                16862    4982   -11880     
  Branches                                 0    1212    +1212     
==================================================================
- Hits                                 10886    3080    -7806     
+ Misses                                5976    1733    -4243     
- Partials                                 0     169     +169     

Flag	Coverage Δ
js-unit-tests	61.8% <57.9%> (?)
php-unit-tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ts/google-ads-account-card/claim-account-button.js	50.0% <100.0%> (ø)
...nts/google-ads-account-card/claim-account/index.js	100.0% <100.0%> (ø)
...s/google-ads-account-card/create-account-button.js	11.1% <100.0%> (ø)
js/src/hooks/useUpsertAdsAccount.js	58.8% <57.1%> (ø)
...mponents/google-ads-account-card/create-account.js	65.6% <37.5%> (ø)

... and 773 files with indirect coverage changes

[ianlin]

Thanks for enhancing the loading state. Tested locally I could confirm the Or, use your existing Google Ads account button is disabled when upserting Google Ads account, and the claiming pop-up window can be opened again after it's closed without successfully claimed.