Add wrapper type hints to product analytics code

What does this MR do and why?

Adds a type hint to each wrapper variable within product analytics areas of the codebase:

/** @type {import('helpers/vue_test_utils_helper').ExtendedWrapper} */
let wrapper;

Based on the functionality introduced in Adds js/tsdocs definitions to js specs helpers (!104622 - merged)

This improves type hinting/autocomplete within tests, as previously wrapper is an unknown / any type (since anything could be assigned to it once declared). The type hint makes it a specific wrapper type.

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Edit any of the product analytics tests
2. Note the (hopefully!) much better autocomplete when working with wrapper, and any of the components / values from the wrapper

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 #424298 (closed)