chore: Improve dev build startup time (#11692)

RustEmbed repeatedly compiled regexes for handling of
'include='/'exclude' statements in a hot loop, which caused each call to
Assets::iter() to take 600ms. Since it is being called twice on our
startup path, that alone contributed over a second to startup time in
debug builds. I've filed a PR with them
https://github.com/pyrossh/rust-embed/pull/244 which brings down the
time for a single iter() call to 6ms.

Release Notes:

- N/A