feat(design)!: remove deprecated properties and directives in DaffAccordionComponent and update usage

[xelaint]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/develop/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

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

What is the current behavior?

• daffAccordionItemContent is deprecated.
• initiallyActive is deprecated.

Part of: #2853

What is the new behavior?

• No longer need to set the directive in order for the content of an accordion item to be placed correctly. Removed all instances of daffAccordionItemContent in usages.
• Updated usages of initiallyActive to initiallyExpanded

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Other information