[infra] Add find_tasks.py script

I found this useful for translating a set of dimensions from a "low
capacity" alert to the set of actual tasks which are affected.

Change-Id: I359cb80a5772f66342d86445e5d8265b10625875
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/885216
Reviewed-by: Kaylee Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
1 file changed