Rename this file to work around a limitation of the GitHub license detection tool, to ensure the repo is correctly tagged as BSD licensed

Closes #37885
https://github.com/dart-lang/sdk/pull/37885

GitOrigin-RevId: 98e7e393d34f05c230bcdb00ac0832f225ef43f0
Change-Id: I86a6bcfd2bf17322a74e3f00db592b1a77501e0e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113340


Reviewed-by: Michael Thomsen <mit@google.com>
Commit-Queue: Michael Thomsen <mit@google.com>