Resolve "Collection of namespace_id and project_id in Snowplow"

What does this MR do?

It adds namespace and project ids to GitLab standard context for Snowplow tracking. This change is behind feature flag unitl this changes are announced by the product

Screenshots or Screencasts (strongly suggested)

Feature flag turned off

ff_off

Feature flag turned on

ff_on

How to setup and validate locally (strongly suggested)

1. In rails console enable feature

 ::Feature.enable(:add_namespace_and_project_to_snowplow_tracking)

1. Set up snowplow micro collector https://docs.gitlab.com/ee/development/snowplow/#snowplow-micro
2. Set external tracing URL in project > settings > monitor http://gdk.test:3000/gitlab-org/gitlab-shell/-/settings/operations
3. visit Snowplow micro collector http://localhost:9090/micro/good and look for event with category: project:operations:tracing and action: external_url_populated check if project and namespace ids are present whiting contexts nested object.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• I have tested this MR in all supported browsers, or it's not needed.
• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.

Related to #338593 (closed)