Update Google Ads API to v18

[mikkamp]

Changes proposed in this Pull Request:

This PR update the Ads API to use V18. The composer packages were already updated in a previous PR.

Required changes:

V16 > V17
GoogleAdsService Search requests: Passing a page_size to GoogleAdsService.Search will result in a RequestError.PAGE_SIZE_NOT_SUPPORTED error.

V17 > V18
GoogleAdsService: The summary_row_setting and return_total_results_count fields in SearchGoogleAdsRequest are now part of the new SearchSettings object.

The original pagination support for campaigns was reverted from this PR, as the Google Ads API has removed the pageSize parameter and sets it to a fixed value of 10000 rows. For general use cases that's ok because of the associated costs most merchants won't be managing 1000's of campaigns.
The initial reason why we did add pagination to the campaigns endpoint is to support the use case where the mobile app only wanted to fetch a single campaign. For this purpose I've left the per_page parameter in place to limit the API response. We still get the full set from the Ads API but we limit the results sent to the API. Because of this limitation it's not possible to fetch subsequent pages. We have a feature request open if we want to implement a full pagination support in the future.

As a temporary measure the headers returning totals and pagination parameters was removed in this PR until we are ready to fully support pagination. I also added some CSS to remove the pagination from the list of campaigns in the dashboard, since this doesn't work.

Detailed test instructions:

1. Check out this PR
2. Reinstall composer packages: rm -rf vendor && composer install
3. Rebuild JS: nvm use && npm start
4. Do a full smoke tests with all requests to the Ads API
5. Test creation of campaigns (with/without assets), as well as edit and delete of campaigns

Additional details:

pcTzPl-2zd-p2

Changelog entry

• Update - Google Ads API to v18.

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.0%. Comparing base (d9c3385) to head (59a6222).
Report is 18 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/API/Google/Query/AdsQuery.php	88.9%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             develop   #2740     +/-   ##
===========================================
+ Coverage       67.0%   67.0%   +0.1%     
+ Complexity      4692    4690      -2     
===========================================
  Files            479     479             
  Lines          19612   19601     -11     
===========================================
+ Hits           13136   13141      +5     
+ Misses          6476    6460     -16     

Flag	Coverage Δ
php-unit-tests	67.0% <96.2%> (+0.1%)	⬆️

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

Files with missing lines	Coverage Δ
src/API/Google/Ads.php	100.0% <ø> (+11.3%)	⬆️
src/API/Google/AdsAsset.php	95.2% <ø> (ø)
src/API/Google/AdsAssetGroup.php	83.3% <100.0%> (+0.1%)	⬆️
src/API/Google/AdsAssetGroupAsset.php	84.8% <ø> (ø)
src/API/Google/AdsCampaign.php	97.4% <100.0%> (-0.1%)	⬇️
src/API/Google/AdsCampaignBudget.php	92.7% <ø> (ø)
src/API/Google/AdsCampaignCriterion.php	100.0% <ø> (ø)
src/API/Google/AdsCampaignLabel.php	100.0% <ø> (ø)
src/API/Google/AdsConversionAction.php	97.6% <ø> (ø)
src/API/Google/AdsReport.php	100.0% <ø> (ø)
... and 11 more

... and 1 file with indirect coverage changes

[ianlin]

Thanks for updating the Google Ads API. I ran the full smoke tests, created campaigns with/without assets, everything worked as expected.