The purpose of this task is to create unit tests for the following files so the unit test coverage is as high as reasonably possible, but higher than 20% line coverage.

Out-of-scope: Any clean-up or modification to the component or file itself—only the unit tests will be changed.

NOTE: There are no changes to the functionality, behavior, or visual changes, no testing beyond passing unit tests is required.

Files to have unit tests written for:

• /src/components/MarketingBanner/marketing-banner.tsx
• /src/components/RosaHandsOn/useDemoExperiencePolling.ts
• /src/components/SyncEditor/SyncEditor.tsx
• /src/components/clusters/ClusterDetailsMultiRegion/components/AccessControl/NetworkSelfServiceSection/NetworkSelfServiceReducer.js
• /src/components/clusters/ClusterDetailsMultiRegion/components/AccessControl/NetworkSelfServiceSection/NetworkSelfServiceSelector.js