[7.x] [canvas] Reduce bundle size by combining SCSS imports (#102822)

[clintandrewhall]

Backports the following commits to 7.x:

• [canvas] Reduce bundle size by combining SCSS imports ([canvas] Reduce bundle size by combining SCSS imports #102822)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 54ecf1b
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
canvas	1106	1043	-63

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
canvas	1.2MB	1.2MB	-21.3KB

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
canvas	461.7KB	461.7KB	+1.0B

History

• 💚 Build #135429 succeeded 4d46c86

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