Refs #36664 -- Updated SMTP EmailBackend tests for Python 3.15.

Versions of Python prior to 3.15 would incorrectly encode non-ASCII
email addresses using rfc2047, resulting in undeliverable email. The
SMTP EmailBackend detects and prevents that (#35713). Python 3.15 fixes
that behavior (CPython issue gh-122476).

Updated test_rejects_non_ascii_local_part() to feature-detect the fix
(in case it is backported) and check for a representative section of
the Python error message if so; otherwise test for the SMTP EmailBackend
workaround.

Updated comments to clarify need and requirement.

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