Skip two of the first run tests that aren't correctly resetting the environment

Try to fix an ubuntu test that has the full path rather than just partial

Author: marcpopMSFT

src/Tests/dotnet-help.Tests/GivenThatIWantToShowHelpForDotnetCommand.cs

@@ -136,7 +136,7 @@ public void WhenRunOnWindowsDotnetHelpCommandShouldContainProperProcessInformati
         public void WhenRunOnLinuxDotnetHelpCommandShouldContainProperProcessInformation()
         {
             var proc = HelpCommand.ConfigureProcess("https://aka.ms/dotnet-build");
-            Assert.Equal("xdg-open", proc.StartInfo.FileName);
+            Assert.Contains("xdg-open", proc.StartInfo.FileName);
             Assert.Equal("https://aka.ms/dotnet-build", proc.StartInfo.Arguments);
 
         }

src/Tests/dotnet.Tests/GivenThatTheUserIsRunningDotNetForTheFirstTime.cs

@@ -112,7 +112,7 @@ public void UsingDotnetForTheFirstTimeWithNonVerbsDoesNotPrintEula()
                 .StartWith(firstTimeNonVerbUseMessage);
         }
 
-        [Fact]
+        [Fact(Skip="https://github.com/dotnet/sdk/issues/43328")]]
         public void ItShowsTheAppropriateMessageToTheUser()
         {
 
@@ -160,7 +160,7 @@ public void ItDoesNotCreateAFirstUseSentinelFileNorAnAspNetCertificateSentinelFi
             homeFolder.Should().NotExist();
         }
 
-        [Fact]
+        [Fact(Skip="https://github.com/dotnet/sdk/issues/43328")]
         public void ItShowsTheTelemetryNoticeWhenInvokingACommandAfterInternalReportInstallSuccessHasBeenInvoked()
         {
             var dotnetFirstTime = new DotNetFirstTime();