fix(components/lists): use 'grid' role for selectable repeaters

[Blackbaud-SteveBrush]

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✅ Successfully ran 10 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/751/code-examples/
• nx build integration --baseHref=https://blackbaud.github.io/skyux-pr-preview/751/integration/
• nx build playground --baseHref=https://blackbaud.github.io/skyux-pr-preview/751/playground/
• nx e2e ag-grid-storybook-e2e --skip-nx-cache
• nx run ag-grid-storybook:build-storybook:ci
• nx run i18n:postbuild
• nx run storybook:build-storybook:ci --outputDir=dist/storybook

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Storybook preview

Component Storybooks:

• ag-grid-storybook

Apps:

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