Deprecate and remove `page.waitForNavigation`

[ankur22]

Feature Description

The page.waitForNavigation is problematic since it's considered racey. I feel the next steps are:

1. to understand exactly when this API is racey and prove it with some tests.
2. build out a plan to deprecate the API and document best practices to move away from it.
3. remove the API in a future release (possibly v2 of k6) since it will be a breaking change.

Suggested Solution (optional)

No response

Already existing or connected issues / PRs (optional)

No response