[infra] Support recursive configs in builder_name_schema

This fixes problems with Upload- tasks which just prefix other types of
task names.

Bug: skia:
Change-Id: Icdbcfc5a889e821c6923f635eae0744c3cb0133c
Reviewed-on: https://skia-review.googlesource.com/121786
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
7 files changed