CI: Reduce log level on Windows

[daipom]

Which issue(s) this PR fixes:
None

What this PR does / why we need it:
For some reason, the log level is Debug only on Windows.
This makes it harder to find failing tests.

Docs Changes:
Not needed.

Release Note:
Not needed.

[ashie]

IMHO I want to leave it as is for a while.

On Windows some tests often become unstable due to other test's state although it shouldn't be.
When I investigate them, I often check which tests are executed before failed tests.
In fact I recently noticed a problem which is caused by a past unrelated pull request.

• Fix command option --quiet #4090 (comment)
• Make TestFluentdCommand tests stable on Windows #4096

It might be hard to find if -v isn't specified:

[daipom]

I see! Thanks for the explanation!
Now I understand the benefits of this setting.
I close this.

[ashie]

BTW for finding failed test I search Failure: or Error: (including former & later spaces) with case sensitive.
It makes easy to find failed tests even if -v is added or not.

[daipom]

Thanks!!
Do you use View raw logs and then search the words?

[ashie]

I use both Web UI and raw logs.

[daipom]

I see! Thanks!