Addon Test: Add demo mode

[yannbf]

Closes #

What I did

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for 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:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

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

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	78.1 MB	78.1 MB	0 B	0.97	0%
initSize	143 MB	143 MB	10.1 kB	1.06	0%
diffSize	65.1 MB	65.1 MB	10.1 kB	3.05	0%
buildSize	6.88 MB	6.88 MB	5.31 kB	12.83	0.1%
buildSbAddonsSize	1.51 MB	1.51 MB	0 B	-	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.9 MB	1.9 MB	0 B	1.67	0%
buildSbPreviewSize	271 kB	271 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.88 MB	3.88 MB	0 B	1.67	0%
buildPreviewSize	3 MB	3 MB	5.31 kB	48.07	0.2%
testBuildSize	0 B	0 B	0 B	-	-
testBuildSbAddonsSize	0 B	0 B	0 B	-	-
testBuildSbCommonSize	0 B	0 B	0 B	-	-
testBuildSbManagerSize	0 B	0 B	0 B	-	-
testBuildSbPreviewSize	0 B	0 B	0 B	-	-
testBuildStaticSize	0 B	0 B	0 B	-	-
testBuildPrebuildSize	0 B	0 B	0 B	-	-
testBuildPreviewSize	0 B	0 B	0 B	-	-

name	before	after	diff	z	%
createTime	8.2s	11.6s	3.4s	-0.22	29.3%
generateTime	25.5s	22.8s	-2s -661ms	-0.04	-11.6%
initTime	17.6s	16.4s	-1s -206ms	0.21	-7.3%
buildTime	8.7s	7.9s	-795ms	-0.98	-10%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.5s	6s	-563ms	-0.17	-9.4%
devManagerResponsive	4.4s	3.9s	-520ms	-0.02	-13.3%
devManagerHeaderVisible	604ms	607ms	3ms	-0.22	0.5%
devManagerIndexVisible	693ms	677ms	-16ms	-0.17	-2.4%
devStoryVisibleUncached	1.1s	1s	-83ms	-0.02	-7.6%
devStoryVisible	686ms	678ms	-8ms	-0.07	-1.2%
devAutodocsVisible	577ms	528ms	-49ms	-0.32	-9.3%
devMDXVisible	558ms	510ms	-48ms	-0.44	-9.4%
buildManagerHeaderVisible	682ms	513ms	-169ms	-0.87	-32.9%
buildManagerIndexVisible	704ms	528ms	-176ms	-0.83	-33.3%
buildStoryVisible	680ms	515ms	-165ms	-0.84	-32%
buildAutodocsVisible	478ms	491ms	13ms	0.09	2.6%
buildMDXVisible	511ms	448ms	-63ms	-0.43	-14.1%

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