Use CodeownersFile.UseRegexMatcherDefault everywhere where applicable + remove obsolete tests (#5437)

This is a follow-up PR to:
- #5241

That PR was supposed to enable the regex-based matcher everywhere, but didn't. This PR fixes that.

This PR also:
- removes the obsolete `ProgramSimplePathTests` test class; it is superseded by `ProgramGlobPathTests`, which is renamed in:
    - #5431
- removes obsolete tests from `get-codeowners.ps1`

This PR is a prerequisite for following PRs:
- #5103
- #5431

Author: Konrad Jamrozik

eng/common/scripts/get-codeowners.ps1

@@ -81,13 +81,18 @@ function TestGetCodeOwner([string]$targetDirectory, [string]$codeOwnerFileLocati
 }
 
 if($Test) {
-  $testFile = (Resolve-Path $PSScriptRoot/../../../tools/code-owners-parser/Azure.Sdk.Tools.RetrieveCodeOwners.Tests/TestData/simple_path_CODEOWNERS)
-  TestGetCodeOwner -targetDirectory "sdk" -codeOwnerFileLocation $testFile -includeNonUserAliases $true -expectReturn @("person1", "person2")
-  TestGetCodeOwner -targetDirectory "sdk/noPath" -codeOwnerFileLocation $testFile -includeNonUserAliases $true -expectReturn @("person1", "person2")
-  TestGetCodeOwner -targetDirectory "/sdk/azconfig" -codeOwnerFileLocation $testFile -includeNonUserAliases $true -expectReturn @("person3", "person4")
-  TestGetCodeOwner -targetDirectory "/sdk/azconfig/package" -codeOwnerFileLocation $testFile -includeNonUserAliases $true  $testFile -expectReturn @("person3", "person4")
-  TestGetCodeOwner -targetDirectory "/sd" -codeOwnerFileLocation $testFile -includeNonUserAliases $true  -expectReturn @()
-  TestGetCodeOwner -targetDirectory "/sdk/testUser/" -codeOwnerFileLocation $testFile -expectReturn @("azure-sdk") 
+  # These tests have been removed; now instead we should run tests from RetrieveCodeOwnersProgramTests, and in a way as explained in:
+  # https://github.com/Azure/azure-sdk-tools/issues/5434
+  # https://github.com/Azure/azure-sdk-tools/pull/5103#discussion_r1068680818
+  Write-Host "These tests have been removed. Please see https://github.com/Azure/azure-sdk-tools/issues/5434 for more."
+  #
+  # $testFile = (Resolve-Path $PSScriptRoot/../../../tools/code-owners-parser/Azure.Sdk.Tools.RetrieveCodeOwners.Tests/TestData/simple_path_CODEOWNERS)
+  # TestGetCodeOwner -targetDirectory "sdk" -codeOwnerFileLocation $testFile -includeNonUserAliases $true -expectReturn @("person1", "person2")
+  # TestGetCodeOwner -targetDirectory "sdk/noPath" -codeOwnerFileLocation $testFile -includeNonUserAliases $true -expectReturn @("person1", "person2")
+  # TestGetCodeOwner -targetDirectory "/sdk/azconfig" -codeOwnerFileLocation $testFile -includeNonUserAliases $true -expectReturn @("person3", "person4")
+  # TestGetCodeOwner -targetDirectory "/sdk/azconfig/package" -codeOwnerFileLocation $testFile -includeNonUserAliases $true  $testFile -expectReturn @("person3", "person4")
+  # TestGetCodeOwner -targetDirectory "/sd" -codeOwnerFileLocation $testFile -includeNonUserAliases $true  -expectReturn @()
+  # TestGetCodeOwner -targetDirectory "/sdk/testUser/" -codeOwnerFileLocation $testFile -expectReturn @("azure-sdk") 
   exit 0
 }
 else {

tools/code-owners-parser/Azure.Sdk.Tools.RetrieveCodeOwners.Tests/ProgramSimplePathTests.cs

@@ -53,7 +53,7 @@ public static int Main(
         bool excludeNonUserAliases = false,
         string? targetDir = null,
         string ignoredPathPrefixes = DefaultIgnoredPrefixes,
-        bool useRegexMatcher = false)
+        bool useRegexMatcher = CodeownersFile.UseRegexMatcherDefault)
     {
         try 
         {
@@ -109,7 +109,7 @@ private static Dictionary<string, CodeownersEntry> GetCodeownersForGlobPath(
         string codeownersFilePathOrUrl,
         bool excludeNonUserAliases,
         string[]? ignoredPathPrefixes = null,
-        bool useRegexMatcher = false)
+        bool useRegexMatcher = CodeownersFile.UseRegexMatcherDefault)
     {
         ignoredPathPrefixes ??= Array.Empty<string>();
 
@@ -131,7 +131,7 @@ private static CodeownersEntry GetCodeownersForSimplePath(
         string targetPath,
         string codeownersFilePathOrUrl,
         bool excludeNonUserAliases,
-        bool useRegexMatcher = false)
+        bool useRegexMatcher = CodeownersFile.UseRegexMatcherDefault)
     {
         CodeownersEntry codeownersEntry =
             CodeownersFile.GetMatchingCodeownersEntry(

tools/code-owners-parser/Azure.Sdk.Tools.RetrieveCodeOwners/Program.cs

@@ -8,7 +8,7 @@ namespace Azure.Sdk.Tools.CodeOwnersParser
 {
     public static class CodeownersFile
     {
-        private const bool UseRegexMatcherDefault = true;
+        public const bool UseRegexMatcherDefault = true;
 
         public static List<CodeownersEntry> GetCodeownersEntriesFromFileOrUrl(
             string codeownersFilePathOrUrl)