Test: Fix support for TS < 4.7

[ndelangen]

Closes #28883

What I did

Fix the issue by changing how we expose the canvas proprty's type.

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

As per recommendation from @kasperpeulen :

• I went into a random story
• Changed canvasElement to canvas
• checked if there's autocompletion available (it was)

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	76.3 MB	76.3 MB	0 B	1	0%
initSize	169 MB	169 MB	24 B	2.44	0%
diffSize	92.6 MB	92.6 MB	24 B	2.44	0%
buildSize	7.46 MB	7.46 MB	0 B	2.34	0%
buildSbAddonsSize	1.61 MB	1.61 MB	0 B	2.56	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	2.3 MB	2.3 MB	0 B	2.27	0%
buildSbPreviewSize	350 kB	350 kB	0 B	-2.38	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.46 MB	4.46 MB	0 B	2.27	0%
buildPreviewSize	3 MB	3 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	26.3s	11.4s	-14s -826ms	-0.46	-129%
generateTime	22.4s	24s	1.6s	2.3	🔺6.8%
initTime	19.5s	21.2s	1.7s	1.56	🔺8.3%
buildTime	12.7s	11.3s	-1s -392ms	-0.55	-12.3%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.5s	8.8s	2.3s	0.8	26.9%
devManagerResponsive	4.3s	5.8s	1.5s	1.75	🔺26.2%
devManagerHeaderVisible	767ms	978ms	211ms	1.7	🔺21.6%
devManagerIndexVisible	810ms	1s	225ms	1.83	🔺21.7%
devStoryVisibleUncached	1.2s	1.5s	382ms	1.51	🔺24.1%
devStoryVisible	809ms	1s	227ms	1.69	🔺21.9%
devAutodocsVisible	642ms	890ms	248ms	1.32	🔺27.9%
devMDXVisible	650ms	865ms	215ms	0.94	24.9%
buildManagerHeaderVisible	650ms	815ms	165ms	0.7	20.2%
buildManagerIndexVisible	657ms	823ms	166ms	0.74	20.2%
buildStoryVisible	712ms	864ms	152ms	0.75	17.6%
buildAutodocsVisible	714ms	799ms	85ms	1.24	🔺10.6%
buildMDXVisible	586ms	730ms	144ms	0.93	19.7%

[greptile-apps]

LGTM

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