Add align-self: flex-start to group heading directly

[TylerJDev]

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What are you trying to accomplish?

Applies flex-start directly to the group heading in ActionList. This ensures that anything inside of .ActionList-sectionDivider that isn't the group heading won't receive the align-items style.

Integration

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• Added/updated tests
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[changeset-bot]

🦋 Changeset detected

Latest commit: cb593b4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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