Fix gulpfile tasks in release zip, but limit packaged scripts

[ggetz]

Fixes #3911

We removed the gulpfile in #10281, but after seeing #6025, I think that was the wrong move.

The reason we removed it was that it was no longer possible to run any gulp tasks from within the release zip. However, this was due to #8659 is fixed here by including .gulp.json.

Additionally, it's only possible and helpful a subset of scripts in the release zip. So this PR limits those to the following list:

• start
• start-public
• clean
• cloc
• coverage
• eslint
• build-specs
• test-*
• prettier-check

This list is arrived at by omitting build and watch tasks, as well as the deploy-* tasks. Including generateDocumentation and build-ts is arguable since they can be run to verify the validity of the docs. But we already included the generated output, and the size of the documentation build tools are not as negligable as eslint or prettier.

In order to run those, we include include .eslintrc.json,.eslintignore, related eslint config files in the release zip (~7KB uncompressed); .prettierignore (<1KB uncompressed); and Specs/** which was previously, but I believe erroneously, excluded in #10281.

Finally, after #10293 adds back the browser spec runner and associated files, we can re-add the link to the spec runner removed from index.release.html in #10184.

[cesium-concierge]

Thanks for the pull request @ggetz!

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[ebogo1]

Looks good, just a minor comment! I agree with the scripts we left for the release zip and I tested all of them just to be safe.

[ggetz]

Thanks @ebogo1! Updated.

[ebogo1]

Hm, this is a pretty niche use case but I noticed that if we run npm run clean followed by npm run build-specs, the latter fails because clean removes the SpecList.js file. This happens in the non-release version as well, but if there's no way to rebuild SpecList.js from the release zip (it's part of the "build" task) maybe it's worth reconsidering how we include the build-specs task.

I think it's minor enough to not do anything about it in this PR but thought I'd mention it.

[ggetz]

Good point. Maybe we should omit the clean script entirely then, since its possible to clean files which can't be re-created from within the release zip.

[ebogo1]

Should the cloc script be removed too then?

[ggetz]

Yeah, I think that follows. I also don't see an equivalent command in packages from comparable projects.

[ggetz]

Updated once again.

[ebogo1]

Cool, thanks @ggetz!