Block Shipping, Products and Coupons when Sync Push is disabled

[puntope]

Changes proposed in this Pull Request:

Block Merchant Center Sync in case the Sync is disabled for the datatype

Detailed test instructions:

1. Checkout PR and have a completed onboarding. All the Sync Datatype for PUSH should be enabled
2. Create a product. Go to WoOCommere Scheduled actions and see gla/jobs/update_products/process_item. Run it
3. Update the product. Go to WoOCommere Scheduled actions and see gla/jobs/update_products/process_item. Run it
4. Create a coupon and select "Show in Google" . Go to WoOCommere Scheduled actions and see gla/jobs/update_coupon/process_item. Run it
5. Create a coupon and select "Show in Google". Go to WoOCommere Scheduled actions and see gla/jobs/update_coupon/process_item. Run it
6. Go to Google - Shipping tab and select "Automatically sync my store’s shipping settings to Google."
7. Go to WooCommerce - Settings - Shipping and create a Shipping Zone
8. Go to WooCommerce - Status - Scheduled Actions and see gla/jobs/update_shipping_settings/process_item
9. Deactivate Push Sync for Products, Coupons and Shipping
10. Repeat step 3. No Job should be scheduled
11. Try to sync a product manually using the Connection Test Page. It should fail. "Error submitting product to Google: Pushing products will not run if the PUSH Sync functionality has been disabled."
12. Repeat steps 5. No Job should be scheduled
13. Repeat step 8. No Job should be scheduled

Additional details:

PT: pcTzPl-2yG-p2

Changelog entry

[codecov]

Codecov Report

Attention: Patch coverage is 42.10526% with 33 lines in your changes missing coverage. Please review.

Project coverage is 67.2%. Comparing base (c5c67ec) to head (8bced8e).
Report is 401 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Product/ProductSyncer.php	7.1%	13 Missing ⚠️
src/ConnectionTest.php	0.0%	6 Missing ⚠️
src/Coupon/CouponSyncer.php	64.3%	5 Missing ⚠️
src/Coupon/SyncerHooks.php	50.0%	3 Missing ⚠️
src/Product/SyncerHooks.php	50.0%	3 Missing ⚠️
src/API/Google/Settings.php	0.0%	2 Missing ⚠️
src/Jobs/AbstractCouponSyncerJob.php	0.0%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             develop   #2810     +/-   ##
===========================================
- Coverage       67.3%   67.2%   -0.1%     
- Complexity      4709    4721     +12     
===========================================
  Files            481     481             
  Lines          19725   19770     +45     
===========================================
+ Hits           13267   13281     +14     
- Misses          6458    6489     +31     

Flag	Coverage Δ
php-unit-tests	67.2% <42.1%> (-0.1%)	⬇️

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

Files with missing lines	Coverage Δ
src/Jobs/AbstractProductSyncerBatchedJob.php	100.0% <100.0%> (ø)
src/Jobs/AbstractProductSyncerJob.php	100.0% <100.0%> (ø)
src/Jobs/UpdateShippingSettings.php	100.0% <100.0%> (ø)
src/MerchantCenter/MerchantCenterService.php	91.5% <100.0%> (-1.3%)	⬇️
src/Shipping/SyncerHooks.php	100.0% <100.0%> (ø)
src/Jobs/AbstractCouponSyncerJob.php	0.0% <0.0%> (ø)
src/API/Google/Settings.php	6.2% <0.0%> (-<0.1%)	⬇️
src/Coupon/SyncerHooks.php	77.8% <50.0%> (-0.9%)	⬇️
src/Product/SyncerHooks.php	89.0% <50.0%> (-1.7%)	⬇️
src/Coupon/CouponSyncer.php	69.9% <64.3%> (-2.6%)	⬇️
... and 2 more

... and 3 files with indirect coverage changes

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[mikkamp]

Thanks @puntope for working on these changes.

As explained in the comments, I think we should follow some of the simple logic as is done for Shipping. As it is right now a product/coupon status will still be changed to pending sync even if push is disabled, we should not allow any changes if it's disabled.

[budzanowski]

This PR will be delivered as part of the combined effort in #2981, which includes both the sync push controls and WC REST API settings integration. Closing this individual PR in favor of the combined approach.