Resolve "Add Snowplow Support to Bring Your Own Cluster"

What does this MR do and why?

Add support for product_analytics_configurator_connection_string to project-level product analytics settings

How to set up and validate locally

1. Setup product analytics devkit according to instructions
2. Setup snowplow support according to instructions
3. Enable product_analytics_snowplow_support feature flag
4. Set invalid value for instance level product_analytics_configurator_connection_string in Application Settings >> General >> Product Analytics
5. Set valid value for project level product_analytics_configurator_connection_string in Project Settings >> General >> Product Analytics
6. Run the projectInitializeProductAnalytics mutation for the project, i.e.

  projectInitializeProductAnalytics(input: {
    projectPath:"flightjs/Flight"
  }) {
    project {
      fullPath
    },
    errors
  }
}

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 #409749 (closed)