Aggregation: Fix aggregation cache invalidation when case sensitivity has changed

Created by: vovakulikov

Fixes https://github.com/sourcegraph/sourcegraph/issues/41346

Test plan

• Search anything that has different results with case:yes/case:no filters
• See aggregation result in the sidebar
• Toggle case sensitivity settings in the search box input
• See that aggregation cache has been invalidated and you see loading state and the most recent aggregation data

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.