Update to gulp 5

[ggetz]

Description

Update to gulp 5.

This is opened as a draft because, while tasks are running, there's still problems. Right now, mainly with the tests.

• Bump gulp version
• Remove outdated stream-to-promise in favor of the native finished
• Remove merge-stream, which does not appear to be maintained. The functionality can be replicated with the gulp API anyway.
• Rearranged some sequential globs to ensure we're working with the new standard
• Passed encoding: false whenever sourcing images or other binary files

Issue number and link

Fixes #10919

Testing plan

1. Ensure make-zip, build-apps, and start task work
2. Ensure test and test-release pass
3. Unzip release file
4. Confirm release sandcastle and viewer app are unchanged

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have update the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

[github-actions]

Thank you for the pull request, @ggetz!

✅ We can confirm we have a CLA on file for you.

[ggetz]

@jjspace Could you please review? The goal would be to get this in sometime this week to ensure it has some time in main before the release.

[jjspace]

@ggetz this mostly looks good, just a few small comments.

I also noticed running npm install complains that install is deprectated. This is from husky install being deprecated. It was replaced just by husky, can you change that in the prepare script?

[ggetz]

Thanks @jjspace! All your feedback should now be addressed.

[jjspace]

LGTM now thanks @ggetz