POC for snowplow tracking verification

What does this MR do and why?

POC for snowplow tracking verification using feature specs against snowplow micro ingestion

• verify growth funnels and help ensure there are no regressions when snowplow micro is setup and env variable VERIFY_TRACKING is set.
• this MR will only focus on optional running of this in local development(test run) environments.
• see description of the overall concept in !135511 (diffs, comment 1652018437)
• POC Run growth funnel verification specs in CI (#432068) will be the next step in the POC to add CI runs.

Screenshots or screen recordings

How to set up and validate locally

1. Setup and start snowplow micro locally following this guide.
2. Set env var VERIFY_TRACKING to 1 or true.
3. Ensure content security policy is allowing correctly. If not using localhost, see gotchas in !135511 (diffs, comment 1648316359)
4. Run test - bundle exec ee/spec/features/registrations/saas/trial_flow_company_creating_project_spec.rb:14

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #428203 (closed)