* account for registration enabled setting when creating accounts
* default to false instead of global setting for initial allowCreateAccount attribute
* consider global allows signup value for whether account creation checkbox shows
* include existing hook when determining if checkout signup is available:
- woocommerce_checkout_registration_enabled hook
* use public api for registration settings (via WC_Checkout)
* initial round of test fixes
* fix logic flaw exposed by tests and align tests with actual values in real use
* return early if WC_Checkout is not available
* remove temporary test group and uncomment new test.
* improve test method name
* fix comment to match new routine name
* ensure block shows login prompt when store disables checkout signup
* fix incorrect conditional order and cover with tests
Co-authored-by: Rua Haszard <rua.haszard@automattic.com>
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