ndr_claims: only use compression if it actually reduces the size

ndr_claims: only use compression if it actually reduces the size

I have captures showing that claims compression depends on the payload
itself and how well it compresses, instead of the pure length of the
payload.

E.g. a single string claim with a value of 68 'a'
characters has an unpressed size of 336
and compressed size is 335.
While a single string with random string s1
has an unpressed size of 504 and it's still
uncompressed on the wire.
A different random string s2 also has an unpressed
size of 504, but it is compressed into a size of 502.

So it really depends if the compression makes it actually
smaller than the uncompressed version.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Feb 14 11:56:49 UTC 2025 on atb-devel-224