fix(components/popovers): screen readers can navigate to popover contents

[Blackbaud-SteveBrush]

AB#3027447

The resulting HTML will look like:

<button type="button" aria-controls="pointer-1" aria-expanded="true"></button>
<span id="pointer-1" aria-owns="popover-1"></span>

...

<sky-popover-content id="popover-1"></sky-popover-content>

[nx-cloud]

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✅ Successfully ran 59 targets

• nx build e2e-schematics --no-agents
• nx build e2e-schematics
• nx e2e split-view-storybook-e2e -c ci --no-agents
• nx e2e lookup-storybook-e2e -c ci --no-agents
• nx e2e progress-indicator-storybook-e2e -c ci --no-agents
• nx e2e phone-field-storybook-e2e -c ci --no-agents
• nx e2e pages-storybook-e2e -c ci --no-agents
• nx e2e modals-storybook-e2e -c ci --no-agents
• nx e2e integration-e2e -c ci --no-agents
• nx e2e layout-storybook-e2e -c ci --no-agents
• nx e2e lists-storybook-e2e -c ci --no-agents
• nx e2e indicators-storybook-e2e -c ci --no-agents
• nx e2e inline-form-storybook-e2e -c ci --no-agents
• nx e2e forms-storybook-e2e -c ci --no-agents
• nx e2e help-inline-storybook-e2e -c ci --no-agents
• nx e2e datetime-storybook-e2e -c ci --no-agents
• nx e2e errors-storybook-e2e -c ci --no-agents
• nx e2e flyout-storybook-e2e -c ci --no-agents
• nx e2e data-manager-storybook-e2e -c ci --no-agents
• nx e2e colorpicker-storybook-e2e -c ci --no-agents
• nx e2e ag-grid-storybook-e2e -c ci --no-agents
• nx e2e avatar-storybook-e2e -c ci --no-agents
• nx e2e action-bars-storybook-e2e -c ci --no-agents
• nx e2e angular-tree-component-storybook-e2e -c ci --no-agents
• nx run storybook:build-storybook:ci --outputDir=dist/storybook --no-agents
• nx run toast-storybook:build-storybook:ci --no-agents
• nx run tiles-storybook:build-storybook:ci --no-agents
• nx run theme-storybook:build-storybook:ci --no-agents
• nx run text-editor-storybook:build-storybook:ci --no-agents
• nx run tabs-storybook:build-storybook:ci --no-agents
• nx run split-view-storybook:build-storybook:ci --no-agents
• nx run progress-indicator-storybook:build-storybook:ci --no-agents
• nx run storybook:build-storybook:ci --no-agents
• nx run phone-field-storybook:build-storybook:ci --no-agents
• nx run pages-storybook:build-storybook:ci --no-agents
• nx run popovers-storybook:build-storybook:ci --no-agents
• nx run navbar-storybook:build-storybook:ci --no-agents
• nx run modals-storybook:build-storybook:ci --no-agents
• nx run lookup-storybook:build-storybook:ci --no-agents
• nx run lists-storybook:build-storybook:ci --no-agents
• nx run layout-storybook:build-storybook:ci --no-agents
• nx run inline-form-storybook:build-storybook:ci --no-agents
• nx run indicators-storybook:build-storybook:ci --no-agents
• nx run help-inline-storybook:build-storybook:ci --no-agents
• nx run forms-storybook:build-storybook:ci --no-agents
• nx run flyout-storybook:build-storybook:ci --no-agents
• nx run datetime-storybook:build-storybook:ci --no-agents
• nx run errors-storybook:build-storybook:ci --no-agents
• nx run data-manager-storybook:build-storybook:ci --no-agents
• nx build playground --baseHref=https://blackbaud.github.io/skyux-pr-preview/2672/playground/ --no-agents
• nx build code-examples --baseHref=https://blackbaud.github.io/skyux-pr-preview/2672/code-examples/ --no-agents
• nx run colorpicker-storybook:build-storybook:ci --no-agents
• nx build integration --baseHref=https://blackbaud.github.io/skyux-pr-preview/2672/integration/ --no-agents
• nx run avatar-storybook:build-storybook:ci --no-agents
• nx run core-storybook:build-storybook:ci --no-agents
• nx run angular-tree-component-storybook:build-storybook:ci --no-agents
• nx run ag-grid-storybook:build-storybook:ci --no-agents
• nx run action-bars-storybook:build-storybook:ci --no-agents
• nx run a11y-storybook:build-storybook:ci --no-agents

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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
• 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-SteveBrush]

Closing in favor of #2729