chore(web): tests in firefox are failing, on Windows agents

[mcdurdin]

e.g. https://build.palaso.org/buildConfiguration/Keymanweb_TestPullRequests/503984?buildTab=log&linesState=648&logView=flowAware&focusLine=1003

• Started failing on 5 November 2024
• Failing on all Windows agents
• Linux agents build fine

https://build.palaso.org/buildConfiguration/Keymanweb_TestPullRequests?branch=&buildTypeTab=overview&mode=builds:

• (17.0.332-test failure on 5 Nov on ba-bionic64ta is unrelated)
• Curious that we have 875 passing tests on Linux but when tests were passing on Windows, we had around 1400 tests passing -- number is not constant which is another concern

[mcdurdin]

I have temporarily taken Windows agents out of the pool for Web-Test by adding Agent Requirement "env.windir == does not exist". Once this is addressed, we should remove this requirement.