GOOWOO-759: Clear connection error slots and improve creation handling

[asvinb]

Changes proposed in this Pull Request:

Closes https://linear.app/a8c/issue/GOOWOO-759/account-creation-limit-reached-error-not-surfaced-to-merchants

Replace this with a good description of your changes & reasoning.

Screenshots:

Detailed test instructions:

1. Disconnect all accounts and go through the onboarding flow.
2. Mock the /wp-json/wc/gla/ads/accounts [POST] endpoint with the mocked data below with the status code set to 406
3. Ensure the error is displayed in the UI when trying to create a new Google Ads account.
4. To test if previous error messages are cleared, mock the /wp-json/wc/gla/ads/accounts [POST] with the payload consisting of id. {"id":<xxx>} where is Google Ads Id you want to connect. Status code is 403

Sample mocked data:

• Mocked response when creating a Google Ads account:

  • {
        "message": "Error creating account: Account creation limit reached. Contact support for help."
    }
    

• Mocked response when connecting a Google Ads account:

  •   {
          "message": "The Google account you are using must have Admin access to Ads account xxx to proceed. Once updated to Admin access, it may take a while for the system to take effect.",
          "code": "API_ERROR",
          "data": {
              "statusCode": 403,
              "error": "Forbidden",
              "message": "The Google account you are using must have Admin access to Ads account xxx to proceed. Once updated to Admin access, it may take a while for the system to take effect."
          }
      }
    

Additional details:

Changelog entry

Fix - Surface Google Ads account creation errors to merchants during onboarding and clear stale errors when switching account actions.

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.3%. Comparing base (2975ff8) to head (21e6c02).
⚠️ Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rd/connect-ads/connect-existing-account-actions.js	50.0%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #3523     +/-   ##
=========================================
+ Coverage     64.1%   64.3%   +0.2%     
=========================================
  Files          395     395             
  Lines         6773    6785     +12     
  Branches      1720    1721      +1     
=========================================
+ Hits          4342    4360     +18     
+ Misses        2170    2166      -4     
+ Partials       261     259      -2     

Flag	Coverage Δ
js-unit-tests	64.3% <86.7%> (+0.2%)	⬆️

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

Files with missing lines	Coverage Δ
...nents/google-ads-account-card/connect-ads/index.js	96.2% <100.0%> (+0.5%)	⬆️
...ents/google-ads-account-card/disconnect-account.js	100.0% <100.0%> (ø)
js/src/hooks/useUpsertAdsAccount.js	100.0% <100.0%> (+47.1%)	⬆️
...rd/connect-ads/connect-existing-account-actions.js	87.5% <50.0%> (-12.5%)	⬇️

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