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Previously, the benchmark timing files & shard map files are manually named. This
CL simplifies all of them to be based on the builder names. This simplifies
the implementation of tools/perf/core/bot_platforms.py file.

This should be a pure refactoring & has no visible effect on how we schedule tests

This is a follow up of Juan's comment in https://chromium-review.googlesource.com/c/chromium/src/+/1188945/6/tools/perf/core/bot_platforms.py#85

Bug:863768

Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: I7aa08e10978f54b7f2b15759d20d64a9c7bd8533
Reviewed-on: https://chromium-review.googlesource.com/1213317Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#589676}