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The 'generated_script' type in MB configs allows the user
to specify an alternative to "bin/run_$target" as the script to
use. However, in order to make things consistent, we really don't
want to support that.

This CL is a first pass at cleanup by removing every case where
script was set to match "bin/run_$target", and then adjusting
the logic in mb.py to supply that.

It also removes a bunch of unnecessary `args` settings where the
setting just matched the default ([]), and updates the doc
comments in gn_isolate_map.pyl.

Bug: 816629
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs
Change-Id: Iedd072c4fc2b53605c0f225152bcc7ee6b80ec5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380420Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#802400}