Set woocommerce_gla_wcs_url to api.woocommerce.com

[martynmjones]

Changes proposed in this Pull Request:

The connect server has now been migrated and we're redirecting traffic from api-vipgo.woocommerce.com to api.woocommerce.com.

This PR updates the default woocommerce_gla_wcs_url value to api.woocommerce.com.

Detailed test instructions:

1. Confirm existing connections work as expected after updating to this branch
2. Confirm that new connections can be established

Changelog entry

Update - Set default connect server URL to api.woocommerce.com

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.8%. Comparing base (292cf66) to head (806370e).

Additional details and impacted files

@@             Coverage Diff              @@
##             develop   #2319      +/-   ##
============================================
+ Coverage       53.9%   63.8%    +9.9%     
- Complexity         0    4205    +4205     
============================================
  Files            293     455     +162     
  Lines           3719   17878   +14159     
  Branches         533       0     -533     
============================================
+ Hits            2006   11412    +9406     
- Misses          1261    6466    +5205     
+ Partials         452       0     -452     

Flag	Coverage Δ
js-unit-tests	?
php-unit-tests	63.8% <100.0%> (?)

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Files	Coverage Δ
src/PluginHelper.php	82.9% <100.0%> (ø)

... and 747 files with indirect coverage changes

[ianlin]

Thanks @martynmjones for updating the connect server url. The new domain worked as expected, LGTM.