Add documentation for writing and debugging E2E tests - Follow-up from "test: add e2e test framework"
The following discussion from !1443 (merged) should be addressed:
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@viktomas started a discussion: non-blocking: add a small section to https://gitlab.com/gitlab-org/gitlab-vscode-extension/blob/592d8ace9ef0b55470a09b73b32f67fc06ce978d/docs/developer/writing-tests.md#L28 so we know how to debug any issues AND/OR write additional tests