Update 'Linked accounts' to include Google Ads

[kt-12]

Changes proposed in this Pull Request:

Closes #2541.

Google Ads have been added to the description.

Screenshots:

Before:
Text: A WordPress.com account, Google account, and Google Merchant Center account are required to use this extension in WooCommerce.

After:
Text: A WordPress.com account, Google account, Google Merchant Center account, and Google Ads account are required to use this extension in WooCommerce.

Detailed test instructions:

1. Start onboarding process 1st step. Under Linked Accounts check the text.

Additional details:

Changelog entry

Tweak - Update the copy in the "Linked accounts" of the accounts connection setting to include Google Ads account.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.8%. Comparing base (d2c2acc) to head (af8c961).
Report is 51 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #2557   +/-   ##
=======================================
  Coverage     63.8%   63.8%           
=======================================
  Files          326     326           
  Lines         5089    5089           
  Branches      1232    1232           
=======================================
  Hits          3247    3247           
  Misses        1674    1674           
  Partials       168     168           

Flag	Coverage Δ
js-unit-tests	63.8% <ø> (ø)

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[joemcgill]

🎯 This one is fine to merge directly to develop once approved.

[ankitguptaindia]

The text has been updated. ✅

BEFORE	AFTER

[joemcgill]

@eason9487 I don't have permissions to merge to the develop branch. Can you merge this one? I think it's fine to go in early.