Publish: Don't distribute src files or unnecessary template files

[shilman]

Closes N/A

What I did

This pull request excludes the src directories from the files fields in the package.json files of all the addons and builders in the Storybook monorepo. This reduces the package sizes and avoids publishing unnecessary source files.

How to test

Need to do a canary release

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "build", "documentation", "maintenance", "dependencies", "other"]

🦋 Canary release

This pull request has been released as version 0.0.0-pr-23853-sha-93b33e06. Install it by pinning all your Storybook dependencies to that version.

More information

Published version	0.0.0-pr-23853-sha-93b33e06
Triggered by	@shilman
Repository	storybookjs/storybook
Branch	shilman/reduce-publish-size
Commit	93b33e06
Datetime	Wed Aug 16 08:48:33 UTC 2023 (1692175713)
Workflow run	5876660633

To request a new release of this pull request, mention the @storybookjs/core team.

core team members can create a new canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=23853

[shilman]

Before

shilman@MBP14 test-vite % du -sh node_modules/@storybook
59M    node_modules/@storybook

After

shilman@MBP14 test-vite % du -sh node_modules/@storybook
 51M    node_modules/@storybook

[yannbf]

Fantastic 👏

[IanVS]

Just curious, how was src being included in the first place? Was it the "*.js"? Most of our src files are typescript, so I'm wondering how you're saving so many MB.

[yannbf]

Yes, the *.js match would include things in src such as src/__mockdata__/someStory.js and things like that.
The biggest chunk that got shaved off doesn't come from that, it comes from changes like this:

-    "template/**/*",
+    "template/cli/**/*",

because we were introducing a lot of example stories that only matter for our sandboxes (a little over 800kb)