CollapsibleCard eliminate 'editMode'

Nahum made a comment in a ticket: https://aclgrc.atlassian.net/browse/UXD-1095?focusedCommentId=302052

>can we remove the concept of isEditing prop in the current CollpasibleCard? and switched it for kind={CollapsibleCard.types.kind.inter'ctive} using the concept `isEditing` don't let room for the component to expand and grow, isEditing is only relevant or make sense during a feature design but doesn't have any functionality in the component apart from just setting the header colour into yellow.

>Removing the concept of editing mode and bringing up the concept for kind gives room to the component to grow organically, for example, if we need a state to mark the card with an error, or if it’s on loading state, we could use the kind property as we use it in the Toast. The other way we will have to incorporate hasError, which doesn’t describe at all what is happening inside of the CollapsibleCard.

>This is part of designing agnostic components and preventing to tide them and mixed them with business logic

Start by locating the CollapsibleCard component and its prop/type definitions, then search for `isEditing` references in its source, tests, and docs. Read those points first to map where the current prop controls header styling. Replace that API with the `kind`-based approach described in the issue (for example `interactive`) and remove edit-mode handling. Finish by running the CollapsibleCard-focused tests/build check and confirm no `isEditing` usage remains and `kind` drives the intended state behavior.

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