fix(core): use multiselect prompts for array properties

[FrozenPandaz]

Current Behavior

ng g @angular/material:mdc-migration does not show a multi select prompt and is broken.

Expected Behavior

ng g @angular/material:mdc-migration does show a multi select prompt and works.

Related Issue(s)

Fixes #

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✅ Successfully ran 11 targets

• nx affected --target=e2e --base=55c20b81c042e6491caabba3f17524cd00aff8ae --head=17cb163a86f92e161b036b31d391dd2498285ca1 --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=test --base=55c20b81c042e6491caabba3f17524cd00aff8ae --head=17cb163a86f92e161b036b31d391dd2498285ca1 --parallel=1
• nx affected --target=build --base=55c20b81c042e6491caabba3f17524cd00aff8ae --head=17cb163a86f92e161b036b31d391dd2498285ca1 --parallel=3
• nx depcheck --no-dte
• nx affected --target=lint --base=55c20b81c042e6491caabba3f17524cd00aff8ae --head=17cb163a86f92e161b036b31d391dd2498285ca1 --parallel=3
• nx lint --no-dte
• nx check-lock-files --no-dte
• nx check-commit --no-dte
• nx-cloud record -- nx format:check --base=55c20b81c042e6491caabba3f17524cd00aff8ae --head=17cb163a86f92e161b036b31d391dd2498285ca1
• nx check-imports --no-dte
• nx documentation --no-dte

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