build(npm): adhere to Husky deprecation notice

Husky v8 adds the `husky init` subcommand, and v9 changes how it handles
hooks. We no longer need the Husky preamble in our hooks, so update to
the new `init` subcommand and remove the preambles.

Change-Id: I18ea1bbaedbb4213cc04c21413d75c9757ff7986
Signed-off-by: Chris Kay <chris.kay@arm.com>