fix(modal): rerender modal when action slot is added

[ashleyryan]

• the slot decorator doesnt update when the slot changes, so a slot listener must be added
• a slot lister cannot be added to a slot that doesnt exist
• instead, always render the slot, but use the hidden attribute
• the slot change event will force the component to update and get the new value of the slot property

fixes #188

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)
• [ ] If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] clarity.design website / infrastructure changes
• [ ] Other... Please describe:

What is the current behavior?

When the actions are supplied asynchronously, they don't show up.

Issue Number: #188

What is the new behavior?

The slot is rendered all the time, just with a hidden attribute. A slot listener was added to make sure the component rerenders to remove the hidden attribute

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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:tada: This PR is included in version 6.2.2 :tada:

The release is available on:

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[github-actions[bot]]

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