fix(accordion): The element should interact only with its direct children

[Nantawat-Poothong]

Description

The accordion listens to expanded-changed events from elements that aren't its direct children.

This PR is sync from v4 https://git.sami.int.thomsonreuters.com/elf/elements/merge_requests/200

Solution

• Add a condition to check if the clicked element is coral-collapse

Fixes # (issue)
https://jira.refinitiv.com/browse/ELF-1638

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

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