Onboarding: Fix code snippet when story name differs from export name

[ghengeveld]

Closes #28626

What I did

Rather than using the story name to lookup the source code snippet for a newly created story, this uses the export name.

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	76.5 MB	76.5 MB	0 B	1.21	0%
initSize	198 MB	198 MB	220 B	-0.46	0%
diffSize	121 MB	121 MB	220 B	-0.47	0%
buildSize	7.59 MB	7.59 MB	13 B	3.09	0%
buildSbAddonsSize	1.63 MB	1.63 MB	13 B	3.25	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	2.3 MB	2.3 MB	0 B	2	0%
buildSbPreviewSize	349 kB	349 kB	0 B	3	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.47 MB	4.47 MB	13 B	3.2	0%
buildPreviewSize	3.12 MB	3.12 MB	0 B	2.38	0%
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	9.1s	24.4s	15.2s	1.69	🔺62.5%
generateTime	21.8s	23.1s	1.3s	0.3	5.9%
initTime	23.5s	22.6s	-914ms	-0.43	-4%
buildTime	14.6s	14.2s	-395ms	-0.21	-2.8%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	8s	7.6s	-379ms	-1.13	-4.9%
devManagerResponsive	5.5s	5.1s	-405ms	-1.34	🔰-7.8%
devManagerHeaderVisible	874ms	803ms	-71ms	0.17	-8.8%
devManagerIndexVisible	898ms	845ms	-53ms	0.43	-6.3%
devStoryVisibleUncached	1.1s	1.3s	180ms	0.39	13.6%
devStoryVisible	914ms	869ms	-45ms	0.43	-5.2%
devAutodocsVisible	809ms	763ms	-46ms	0.44	-6%
devMDXVisible	706ms	665ms	-41ms	-1.38	🔰-6.2%
buildManagerHeaderVisible	1.1s	783ms	-336ms	-0.07	-42.9%
buildManagerIndexVisible	1.1s	785ms	-357ms	-0.09	-45.5%
buildStoryVisible	1.1s	825ms	-373ms	-0.19	-45.2%
buildAutodocsVisible	1s	737ms	-341ms	0.03	-46.3%
buildMDXVisible	786ms	704ms	-82ms	0.26	-11.6%

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