Description:

Based off of #18104

Migrate piwik service + test.

Note: there are some changes regarding how globals are accessed. These are mostly for tests, since the tests are invoked within node.js (so globals are set via the global object), so we have to access them from window rather than just using them.

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed