[PERF] Fix "x$PERF_PREREQS_INSTALLED was unexpected at this time" Err…

…or for Microbenchmarks (#73584)

* Try double brackets.

* Only use the bash check if running on non-windows machine, added command for running on windows machines.

* Undoing changes to if statement brackets (double to single now) as the double bracket is not necessary.

* Use the correct, previously removed command.

eng/testing/performance/microbenchmarks.proj

@@ -131,12 +131,13 @@
     <HelixWorkItem Include="@(Partition)">
       <PayloadDirectory>$(WorkItemDirectory)</PayloadDirectory>
       <PreCommands Condition="'$(Compare)' == 'true'">$(WorkItemCommand) --bdn-artifacts $(BaselineArtifactsDirectory) --bdn-arguments="--anyCategories $(BDNCategories) $(ExtraBenchmarkDotNetArguments) $(BaselineCoreRunArgument) --partition-count $(PartitionCount) --partition-index %(HelixWorkItem.Index)"</PreCommands>
-      <Command>
+      <Command Condition="'$(AGENT_OS)' != 'Windows_NT'">
         if [ "x$PERF_PREREQS_INSTALLED" = "x1" ]; then
           $(WorkItemCommand) --bdn-artifacts $(ArtifactsDirectory) --bdn-arguments="--anyCategories $(BDNCategories) $(ExtraBenchmarkDotNetArguments) $(CoreRunArgument) --partition-count $(PartitionCount) --partition-index %(HelixWorkItem.Index)";
         else
           echo "\n\n** Error: Failed to install prerequisites **\n\n"; export _commandExitCode=1;
         fi</Command>
+      <Command Condition="'$(AGENT_OS)' == 'Windows_NT'">$(WorkItemCommand) --bdn-artifacts $(ArtifactsDirectory) --bdn-arguments="--anyCategories $(BDNCategories) $(ExtraBenchmarkDotNetArguments) $(CoreRunArgument) --partition-count $(PartitionCount) --partition-index %(HelixWorkItem.Index)"</Command>
       <PostCommands Condition="'$(Compare)' == 'true'">$(DotnetExe) run -f $(PERFLAB_Framework) -p $(ResultsComparer) --base $(BaselineArtifactsDirectory) --diff $(ArtifactsDirectory) --threshold 2$(Percent) --xml $(XMLResults);$(FinalCommand)</PostCommands>
       <Timeout>$(WorkItemTimeout)</Timeout>
     </HelixWorkItem>
@@ -146,12 +147,13 @@
     <HelixWorkItem Include="$(BuildConfig).WorkItem">
       <PayloadDirectory>$(WorkItemDirectory)</PayloadDirectory>
       <PreCommands Condition="'$(Compare)' == 'true'">$(WorkItemCommand) --bdn-artifacts $(BaselineArtifactsDirectory) --bdn-arguments="--anyCategories $(BDNCategories) $(ExtraBenchmarkDotNetArguments) $(BaselineCoreRunArgument)"</PreCommands>
-      <Command>
+      <Command Condition="'$(AGENT_OS)' != 'Windows_NT'">
         if [ "x$PERF_PREREQS_INSTALLED" = "x1" ]; then
           $(WorkItemCommand) --bdn-artifacts $(ArtifactsDirectory) --bdn-arguments="--anyCategories $(BDNCategories) $(ExtraBenchmarkDotNetArguments) $(CoreRunArgument)";
         else
           echo "\n\n** Error: Failed to install prerequisites **\n\n"; export _commandExitCode=1;
         fi</Command>
+      <Command Condition="'$(AGENT_OS)' == 'Windows_NT'">$(WorkItemCommand) --bdn-artifacts $(ArtifactsDirectory) --bdn-arguments="--anyCategories $(BDNCategories) $(ExtraBenchmarkDotNetArguments) $(CoreRunArgument)"</Command>
       <PostCommands Condition="'$(Compare)' == 'true'">$(DotnetExe) run -f $(PERFLAB_Framework) -p $(ResultsComparer) --base $(BaselineArtifactsDirectory) --diff $(ArtifactsDirectory) --threshold 2$(Percent) --xml $(XMLResults)</PostCommands>
       <Timeout>4:00</Timeout>
     </HelixWorkItem>