[API Pull] Enable notifications by default

[puntope]

Changes proposed in this Pull Request:

This is a follow-up from this conversation p1719565119808809-slack-C02BB3F30TG

The PR enables Notifications feature by default

Detailed test instructions:

1. Checkout this PR
2. Complete setup
3. Grant access to Data fetch in Settings
4. Go to the connection test page
5. Send a notification and verify it works
6. Add this filter add_filter( 'woocommerce_gla_notifications_enabled', '__return_false' );
7. Send a notification and verify it fails

Additional details:

Changelog entry

[codecov]

Codecov Report

Attention: Patch coverage is 45.45455% with 6 lines in your changes missing coverage. Please review.

Project coverage is 64.4%. Comparing base (dc34f56) to head (d47c264).
Report is 1 commits behind head on feature/google-api-project.

Additional details and impacted files

@@                      Coverage Diff                       @@
##             feature/google-api-project   #2448     +/-   ##
==============================================================
- Coverage                          64.7%   64.4%   -0.3%     
- Complexity                         4550    4551      +1     
==============================================================
  Files                               473     795    +322     
  Lines                             17747   22796   +5049     
  Branches                              0    1219   +1219     
==============================================================
+ Hits                              11483   14688   +3205     
- Misses                             6264    7941   +1677     
- Partials                              0     167    +167     

Flag	Coverage Δ
js-unit-tests	63.5% <ø> (?)
php-unit-tests	64.7% <45.5%> (-<0.1%)	⬇️

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

Files	Coverage Δ
src/API/WP/NotificationsService.php	95.1% <100.0%> (ø)
src/MerchantCenter/AccountService.php	98.3% <100.0%> (+<0.1%)	⬆️
src/ConnectionTest.php	0.0% <0.0%> (ø)

... and 322 files with indirect coverage changes

[jorgemd24]

Thanks @puntope for working on this. It works well, but I noticed that if you add the filter add_filter('woocommerce_gla_notifications_enabled', '__return_false');, the merchant won't be able to revoke access even if the status is approved. Shouldn't we allow the merchant to revoke access in the settings page regardless of the filter value? (Connection Test page is OK)

[puntope]

Hi @jorgemd24 I tweaked the code based on your comments. I also added some info in the Connection Test. Can we have a new look?

[jorgemd24]

Thanks for the adjustments. LGTM 👍