sets shopperContext on page load based on user token presence

[sirugh]

USF-1650

This PR updates storefront-auth to latest version that includes setting of shopperContext on login/logout. It also adds some initialization logic to ensure that when the page loads, the shopper context is set according to whether user is logged in or not (based on cookie presence).

This PR also adds tests and adds a "fix" for the tests where after each test we now delete any created customers (if logged in) just to keep things tidy.

Test URLs:

• Before: https://main--aem-boilerplate-commerce--hlxsites.aem.live/
• After: https://usf-1650--aem-boilerplate-commerce--hlxsites.aem.live/

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Commits

* [a3f1916](https://github.com/hlxsites/aem-boilerplate-commerce/commit/a3f191687672f803440b7204e2c46a545f2e1dfa) :arrows_counterclockwise: (latest) * [4263561](https://github.com/hlxsites/aem-boilerplate-commerce/commit/42635617df0ccd516e6e76e17208aee84aac8dbe) :white_check_mark: * [a94769b](https://github.com/hlxsites/aem-boilerplate-commerce/commit/a94769b65de15823f66145a1b732a5d4d8ed7e95) :white_check_mark: * [fcf647b](https://github.com/hlxsites/aem-boilerplate-commerce/commit/fcf647bf89a90abba6d0d9598852dfd4378dbaf3) :white_check_mark:

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