[dotnet] [build] Don't skip tests on RBE (#17295)

Author: nvborisenko

.skipped-tests

@@ -1,6 +1,3 @@
--//dotnet/test/common:NetworkInterceptionTests-chrome
--//dotnet/test/common:NetworkInterceptionTests-edge
--//dotnet/test/firefox:FirefoxDriverTests-firefox
 -//java/test/org/openqa/selenium/chrome:ChromeDriverFunctionalTest
 -//java/test/org/openqa/selenium/chrome:ChromeDriverFunctionalTest-remote
 -//java/test/org/openqa/selenium/edge:EdgeDriverFunctionalTest