Add telemetry to "Tips and Tricks / More search features" link

Created by: erzhtor

Closes https://github.com/sourcegraph/sourcegraph/issues/34516.

Description

This PR:

• Add telemetry to the "Tips and Tricks / More search features" link
• Add unit tests to the TipsAndTricks component

Test plan

• SOURCEGRAPH_API_URL=https://sourcegraph.com SOURCEGRAPHDOTCOM_MODE=true sg start web-standalone
• Open https://sourcegraph.test:3443/search as non signed-in user
• Enabled event log debug mode in console: localStorage.setItem('eventLogDebug', 'true')
• Click "More search features" link and check that HomepageExampleMoreSearchFeaturesClicked event is logged in console

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.