[Backport 2.0.x] Datahub (fix): Display UpdateFrequencyCustom correctly

[jahow]

Backport of #679

Error on cherry picking:
Error on backporting to branch 2.0.x, error on cherry picking 656ad66:

To continue do:
git fetch && git checkout backport/679-to-2.0.x && git reset --hard HEAD^
git cherry-pick 656ad66
git cherry-pick 4743a10
git push origin backport/679-to-2.0.x --force

[github-actions]

Affected libs: api-metadata-converter, feature-search, feature-record, feature-router, feature-map, feature-dataviz, api-repository, feature-catalog, feature-auth, feature-editor, ui-search, ui-elements, ui-catalog, util-shared, ui-widgets, ui-inputs, data-access-datafeeder, util-data-fetcher, util-app-config, common-fixtures, ui-map, data-access-gn4, common-domain, ui-dataviz, util-i18n, ui-layout,
Affected apps: metadata-converter, metadata-editor, datafeeder, demo, datahub, webcomponents, search, map-viewer, data-platform,

• 🚀 Build and deploy storybook and demo on GitHub Pages
• 📦 Build and push affected docker images

[coveralls]

coverage: 86.72% (+4.4%) from 82.28%
when pulling ddb0857 on backport/679-to-2.0.x
into 67c862f on 2.0.x.