Add emoji exclusions file

This file is used by fontchain_linter. The file is added for temporary
font drops. When the final font is dropped the file should be emptied
to verify that emoji font complies with Unicode data files.

Test: m fontchain_lint
Bug: 77148691
Change-Id: Id042fe843a96dc1e2bc2de37010ad73716ee2fee
(cherry picked from commit 5a2341bf)
Merged-In: Id042fe843a96dc1e2bc2de37010ad73716ee2fee
Merged-In: I0ddf0ba2dde3a27ff368441c7c2a2e5fc111c856
Merged-In: I437c7e31f0946bcfeab794215a266cf3b0b9552f