fusefs: invalidate the cache during copy_file_range

FUSE_COPY_FILE_RANGE instructs the server to write data to a file.
fusefs must invalidate any cached data within the written range.

PR: 260242
Reviewed by: pfg
Differential Revision: https://reviews.freebsd.org/D33280

(cherry picked from commit 41ae9f9e644d1196bebacdb3748670f36b354384)