fix(Faro): Filter out events not related to the app

[grafakus]

✨ Description

Related issue(s): -

This PR ensures that only the Explore Profiles events are sent to Faro.

Slack context: https://raintank-corp.slack.com/archives/C06M1RVAA0Z/p1729077589541799

📖 Summary of the changes

• The beforeSend hook has been added when initializing Faro, as suggested in the docs
• This PR also changes the Faro URLs to send events to a more suitable instance (if needed, ping me for more details)
• Some minor TS changes, not directly related to this PR's goal (see https://github.com/grafana/explore-profiles/pull/223#discussion_r1804413954)

🧪 How to test?

This change can be tested locally, by uncommenting the relevant code in faro.ts

[github-actions[bot]]

Unit test coverage

Lines	Statements	Branches	Functions
	11.49% (428/3723)	9.03% (120/1328)	8.52% (101/1185)