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Rename Diagnosticsd mojo and D-Bus interfaces to WilcoDtcSupportd.

Since the renamed code is meant only for wilco_dtc_supportd usage and
is not used for pure diagnostics purposes, the name is confusing.

It is a final CL for the wilco_dtc_supportd rename.

BUG=b:124423615
TEST=build,unit_tests

Change-Id: I2447d6db96eea8c0e54be399aae7c0b178adfdd2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1565984
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656387}