Remove IWYU build logic from Bazel

Follow-up from https://skia-review.googlesource.com/c/skia/+/896098/13/infra/bots/jobs.json#b17

Change-Id: I7f9d3860ba2cedebe55523dfdf1d80d4387f2d46
Bug: b/40044159
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1024156
Auto-Submit: Kaylee Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
Commit-Queue: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
39 files changed