doc: remove ETW tool from tier list
Hey
Context
The diagnostic working group currently works on an initiative to re-evaluate the diagnostic tooling list and its maturity.
Updated
In the previous instance, we examined the case of the ETW module: issue link.
We decide to remove it, as anyone in the instance has an idea about a potential usage in the field. We prefer to have a list that contains fewer items but is trustable. In case you have a different opinion, please share your thoughts in this PR
Discuss
As usual, feel free to share your thoughts on that and your experience with this tool.
With love
cc @nodejs/diagnostics