[dawn][tint] Rerun formatters on all C++-like and Python files

A significant number of formatting errors had somehow crept in. Many of
these were indentation that I believe is due to imprecision in
`git cl format`'s heuristic to avoid reformatting unchanged lines.
Some of them are most likely due to changes in clang-format itself.

In addition to fixing incorrectly formatted code, this also makes it
possible to use IDE/editor clang-format integrations, which won't have
that heuristic.

- First fixed a missing `// clang-format off` directive in `Format.cpp`
- Then ran:

  git ls-tree -r main --name-only | grep -E '\.(h|c|cpp|cc|m|mm)$' | xargs clang-format -i
  git ls-tree -r main --name-only | grep -E '\.py$' | xargs yapf -i

- Then reran `git cl format` to confirm that those commands used the
  correct config.

Bug: None
Change-Id: I685b6d00e0960934fd0ca9c9e7c5963e554f35bf
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/289816
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: dan sinclair <dsinclair@chromium.org>