Brian Clozel 25e8395df8 Reject duplicate MIME type parameters
Prior to this commit, MIME type parsing in Spring would allow duplicate
parameters like "text/plain; dupe=1; dupe=2", effectively retaining the
latest value and ignoring the first.

RFC 6838 4.3 states that this should be treated as an error and this
commit ensures that this is the case.

Closes gh-36841
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