Fix .gitignore to allow PowerShell module bin folders (#4574)

* Initial plan

* Fix gitignore to allow PowerShell module bin folders

Co-authored-by: liliankasem <2198905+liliankasem@users.noreply.github.com>

* Remove trailing whitespace from test file to fix StyleCop warnings

Co-authored-by: surgupta-msft <16623184+surgupta-msft@users.noreply.github.com>

* Fix failing PowerShell module test to use actual gitignore content

Co-authored-by: surgupta-msft <16623184+surgupta-msft@users.noreply.github.com>

* Fix missing closing brace in GitIgnoreParserTests.cs

Co-authored-by: liliankasem <2198905+liliankasem@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: liliankasem <2198905+liliankasem@users.noreply.github.com>
Co-authored-by: surgupta-msft <16623184+surgupta-msft@users.noreply.github.com>

Author: 3 people

src/Cli/func/StaticResources/gitignore

@@ -1,4 +1,6 @@
-bin
+bin/
+**/bin/
+!Modules/**
 obj
 csx
 .vs

test/Cli/Func.UnitTests/ParserTests/GitIgnoreParserTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
+using Azure.Functions.Cli;
 using Azure.Functions.Cli.Common;
 using FluentAssertions;
 using Xunit;
@@ -147,5 +148,25 @@ public void DeniesShouldNotDenyNestedUnignoredFilesInIgnoredDirectories()
         {
             _gitignore.Denies("nonexistent/foo/wat").Should().BeFalse();
         }
+
+        [Fact]
+        public async void PowerShellModuleBinFoldersShouldBeHandledCorrectly()
+        {
+            // Test the current gitignore content from the actual static resource
+            var currentGitIgnore = await StaticResources.GitIgnore;
+
+            var currentParser = new GitIgnoreParser(currentGitIgnore);
+
+            // These paths should be ignored (regular bin folders)
+            currentParser.Denies("bin/somefile.dll").Should().BeTrue();
+            currentParser.Denies("src/bin/output.dll").Should().BeTrue();
+
+            // These PowerShell module paths should NOT be ignored with the updated gitignore
+            currentParser.Denies("Modules/Az.Storage/8.1.0/Storage.Autorest/bin/Az.Storage.private.dll").Should().BeFalse("PowerShell module bin files should not be ignored");
+            currentParser.Denies("Modules/SomeModule/1.0.0/bin/Module.dll").Should().BeFalse("PowerShell module bin files should not be ignored");
+
+            // Non-bin files in modules should not be ignored
+            currentParser.Denies("Modules/Az.Accounts/2.0.0/lib/netstandard2.0/Microsoft.Azure.dll").Should().BeFalse();
+        }
     }
 }