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metadata-exporter builder is modernization of
https://ci.chromium.org/p/chromium/builders/ci/linux_chromium_component_updater

It uses a new recipe which uses a new tool that understands both
legacy OWNERS and new DIR_METADATA files.

Try using new bbagent (as opposed to kitchen) from the start.

Rename "component-mapping" notifier to "metadata-mapping" because it
is cheap, compared to changing mailing list emails and service
account emails.

Create a new Milo console for new builder.
Move existing builder from goma-specific console, because it has
nothing to do with goma.

Bug: 1102997
Change-Id: Ia0a988768c334b319fc11c38804c524a899fb119
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300602
Commit-Queue: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788752}