CmdPal: Removing Core projects (#45693)

Functionally, no differences.

- Removed Core projects.
- Core.Common => Microsoft.CmdPal.Common
- Core.ViewModels => Microsoft.CmdPal.UI.ViewModels

---------

Co-authored-by: Jiří Polášek <me@jiripolasek.com>

src/modules/cmdpal/Tests/Microsoft.CmdPal.Common.UnitTests/TestUtils/SanitizerTestHelper.cs

@@ -0,0 +1,110 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.RegularExpressions;
+using Microsoft.CmdPal.Common.Services.Sanitizer.Abstraction;
+
+namespace Microsoft.CmdPal.Common.UnitTests.TestUtils;
+
+/// <summary>
+/// Test-only helpers for applying SanitizationRule sets without relying on production ITextSanitizer implementation.
+/// </summary>
+public static class SanitizerTestHelper
+{
+    /// <summary>
+    /// Applies the provided rules to the input, in order, mimicking the production sanitizer behavior closely
+    /// but without any external dependencies.
+    /// </summary>
+    public static string ApplyRules(string? input, IEnumerable<SanitizationRule> rules)
+    {
+        if (string.IsNullOrEmpty(input))
+        {
+            return input ?? string.Empty;
+        }
+
+        var result = input;
+        foreach (var rule in rules ?? [])
+        {
+            try
+            {
+                var previous = result;
+                result = rule.Evaluator is null
+                    ? rule.Regex.Replace(previous, rule.Replacement ?? string.Empty)
+                    : rule.Regex.Replace(previous, rule.Evaluator);
+
+                // Guardrail to avoid accidental mass-redaction from a faulty rule
+                if (result.Length < previous.Length * 0.3)
+                {
+                    result = previous;
+                }
+            }
+            catch (RegexMatchTimeoutException)
+            {
+                // Ignore timeouts in tests
+            }
+        }
+
+        return result;
+    }
+
+    /// <summary>
+    /// Creates a lightweight sanitizer instance backed by the given rules.
+    /// Useful when a component expects an ITextSanitizer, but you want deterministic behavior in tests.
+    /// </summary>
+    public static ITextSanitizer CreateSanitizer(IEnumerable<SanitizationRule> rules)
+        => new InlineSanitizer(rules);
+
+    private sealed class InlineSanitizer : ITextSanitizer
+    {
+        private readonly List<SanitizationRule> _rules;
+
+        public InlineSanitizer(IEnumerable<SanitizationRule> rules)
+        {
+            _rules = rules?.ToList() ?? [];
+        }
+
+        public string Sanitize(string? input) => ApplyRules(input, _rules);
+
+        public void AddRule(string pattern, string replacement, string description = "")
+        {
+            var rx = new Regex(pattern, RegexOptions.Compiled | RegexOptions.CultureInvariant);
+            _rules.Add(new SanitizationRule(rx, replacement, description));
+        }
+
+        public void RemoveRule(string description)
+        {
+            _rules.RemoveAll(r => r.Description.Equals(description, StringComparison.OrdinalIgnoreCase));
+        }
+
+        public IReadOnlyList<SanitizationRule> GetRules() => _rules.AsReadOnly();
+
+        public string TestRule(string input, string ruleDescription)
+        {
+            var rule = _rules.FirstOrDefault(r => r.Description.Contains(ruleDescription, StringComparison.OrdinalIgnoreCase));
+            if (rule.Regex is null)
+            {
+                return input;
+            }
+
+            try
+            {
+                if (rule.Evaluator is not null)
+                {
+                    return rule.Regex.Replace(input, rule.Evaluator);
+                }
+
+                if (rule.Replacement is not null)
+                {
+                    return rule.Regex.Replace(input, rule.Replacement);
+                }
+            }
+            catch
+            {
+                // Ignore exceptions for test determinism
+            }
+
+            return input;
+        }
+    }
+}