fix: [SAML Views] Accept an "enterprise_customer_uuid" query param (instead of "enterprise-id")

SAML views should accept "enterprise_customer_uuid", not "enterprise-id".

There was a typo in the original docstring which claimed the correct
param name was "enterprise-id" which was over-indexed by Claude Code as
a source of truth, causing it to recommend a behavior change when
migrating the views.  I should have caught this, but I also saw the
docstring myself and over-indexed on it.

The original docstring typo: https://github.com/openedx/openedx-platform/blob/01dc3c84/common/djangoapps/third_party_auth/samlproviderconfig/views.py#L33

ENT-11567