Fix GTM order placement event when user was guest

[Michal-Dziedzinski]

Related Issues

closes #4064

Short Description and Why It's Useful

GTM order placement event didn't trigger when user was placing order as a guest. If orders are not fetched, data to GTM event are from store.

Which Environment This Relates To

Check your case. In case of any doubts please read about Release Cycle

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing Vue Storefront sites with this new feature

IMPORTANT NOTICE - Remember to update CHANGELOG.md with description of your change

Contribution and Currently Important Rules Acceptance

• I read and followed contribution rules

[simonmaass]

shipping and tax are wrongly switched

[simonmaass]

@andrzejewsky @Michal-Dziedzinski tax and shipping are switched

[andrzejewsky]

@Michal-Dziedzinski can you fix that?

[Michal-Dziedzinski]

@andrzejewsky sure, #4117