[6.0.x] Clarified optional nature of Contributor License Agreement.

It's not clear that CLAs are needed to ensure contributors are
assenting to our license (the "inbound=outbound" agreement),
but we can keep them around for contributors who would like to
(or are required by their employer) to submit one, without
investing additional resources in checking every single contribution.

See https://forum.djangoproject.com/t/cla-vs-dco-for-django-contributors/42399
and recent board minutes.

Backport of 0dac3dd4a1573b3c9cef3aea6a98440decfc5460 from main.

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