refactor(components/popovers): popovers final strict mode support

[Blackbaud-TrevorBurch]

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[nx-cloud]

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✅ Successfully ran 16 targets

• nx affected --target=build --parallel=3
• nx affected --target=test --browsers=ChromeHeadless --code-coverage --parallel=3 --progress=false --source-map --watch=false
• nx affected:lint --quiet --silent --parallel=3
• nx build code-examples --baseHref=https://blackbaud.github.io/skyux-pr-preview/554/code-examples/
• nx build integration --baseHref=https://blackbaud.github.io/skyux-pr-preview/554/integration/
• nx build playground --baseHref=https://blackbaud.github.io/skyux-pr-preview/554/playground/
• nx e2e ag-grid-storybook-e2e --skip-nx-cache
• nx e2e layout-storybook-e2e --skip-nx-cache
• nx e2e popovers-storybook-e2e --skip-nx-cache
• nx e2e tabs-storybook-e2e --skip-nx-cache
• nx run ag-grid-storybook:build-storybook:ci
• nx run i18n:postbuild
• nx run layout-storybook:build-storybook:ci
• nx run popovers-storybook:build-storybook:ci
• nx run storybook:build-storybook:ci --outputDir=dist/storybook
• nx run tabs-storybook:build-storybook:ci

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[blackbaud-sky-build-user]

Storybook preview

Component Storybooks:

• ag-grid-storybook
• layout-storybook
• popovers-storybook
• tabs-storybook

Apps:

• code-examples
• dep-graph
• integration
• playground