Validate displayName for AssociationRequest

validate the length of displayName in the constructor, setDisplayName
and the builder

Test: cts
Flag: EXEMPT BUGFIX
Bug: 443742829
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:92dc1af578462212ac04a063bdc407100305436e
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:70f0250ce354fc6af4d7db1f88dae335bba5ccfa
Merged-In: I41dc3804c35328a5968716f502c4320a58b75158
Change-Id: I41dc3804c35328a5968716f502c4320a58b75158