[core] fix: constrain DialogFooter children width

[berryde]

Fixes #6809

Checklist

• Includes tests
• Update documentation

Changes proposed in this pull request:

This pull request adds flex-shrink: 1 to the DialogFooter's main section to fix an issue where providing content such as long text would cause the actions to be pushed out of the footer.

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Type

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• Fix
• Break
• Deprecation
• Manual task
• Migration

Description

[core] fix: constrain DialogFooter children width

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Build artifact links for this commit: documentation | landing | table | demo

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