Adjust spacing and sizes for different aggregation UI screens

Created by: vovakulikov

Fixes https://github.com/sourcegraph/sourcegraph/issues/41428

Background

This PR adjusts error, loading, no-data and query error UI screens for the sidebar mode

• Makes bar skeleton chart taller
• Increase bar skeleton bars for the sidebar panel mode (in order to make it proportional for new sizes)
• Adjust height for bar chart on the full UI mode

Test plan

• Run repo:^github\.com/sourcegraph/sourcegraph$ insights and check loading state and data state
• Switch to files aggregation mode
• Add type:commit
• Check error aggregation mode
• Switch to author aggregation mode and replace type:commit with type:diff (it should trigger Run aggregation screen)
• Check run aggregation screen
• Check the same flow for the full UI mode

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.