[infra] Remove CIFuzz task

Don't have the cycles to maintain the build.

Change-Id: Ia06cd78f5920091fcad250391a4d91b039e97f5d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/432777
Reviewed-by: Kevin Lubick <kjlubick@google.com>
8 files changed