Remove superfluous includes for data_decoder.h

Headers that don't reference data_decoder:: or "namespace data_decoder"
don't need to include services/data_decoder/public/cpp/data_decoder.h.
Remove the include from those headers and do IWYU to fix the build.

Bug: 40318405
Change-Id: I0d79d8f3f7d4fecec365b84b016c0a4c98e8479b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7037007
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Lei Zhang <thestig@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Owners-Override: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1529558}