adds support for setting multiple variables to varSet

[ppisljar]

Summary

var_set expression function now supports setting multiple variables at once.

resolves #69316

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for cross-browser compatibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[ppisljar]

@elasticmachine merge upstream

[ppisljar]

@elasticmachine merge upstream

[streamich]

Code change LGTM.

[ppisljar]

@elasticmachine merge upstream

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 34feca9
• Storybooks Preview

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
expressions	1467	1469	+2

Page load bundle

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

id	before	after	diff
expressions	202.7KB	202.8KB	+80.0B

Unknown metric groups

API count

id	before	after	diff
expressions	1894	1896	+2

History

• 💚 Build #130951 succeeded 34feca9
• 💚 Build #130479 succeeded 899d3fe
• 💚 Build #130426 succeeded 04d9fa6
• 💔 Build #129699 failed 31a7610
• 💔 Build #129687 failed 8a2daed

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream