feat(components/popovers): implement disclosure pattern for popovers

[Blackbaud-SteveBrush]

Refer to the original PR for notes and description: #2717

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[blackbaud-sky-build-user]

Storybook preview

Component Storybooks:

• a11y-storybook
• action-bars-storybook
• ag-grid-storybook
• angular-tree-component-storybook
• avatar-storybook
• colorpicker-storybook
• core-storybook
• cypress-screenshots-text-editor-storybook-e2e
• data-manager-storybook
• datetime-storybook
• errors-storybook
• flyout-storybook
• forms-storybook
• help-inline-storybook
• indicators-storybook
• inline-form-storybook
• layout-storybook
• lists-storybook
• lookup-storybook
• modals-storybook
• navbar-storybook
• pages-storybook
• phone-field-storybook
• popovers-storybook
• progress-indicator-storybook
• split-view-storybook
• storybook
• tabs-storybook
• text-editor-storybook
• theme-storybook
• tiles-storybook
• toast-storybook

Apps:

• code-examples
• integration
• playground

[blackbaud-sky-build-user]

Cherry-pick failed! ❌ Please resolve conflicts and create a new PR.