V16 cherry pick of member partial cache invalidator see #19314 (#19459)

* v16 cherry pick of member partial cache invalidator see #19314

# Resolved merge conflic in src/Umbraco.Core/Cache/Refreshers/Implement/MemberCacheRefresher.cs

* Take nullmember cacheitems into account

tests/Umbraco.Tests.UnitTests/Umbraco.Web.Website/Cache/PartialViewCacheInvalidators/MemberPartialViewCacheInvalidatorTests.cs

@@ -0,0 +1,76 @@
+using System.Text.RegularExpressions;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Microsoft.AspNetCore.Mvc.ViewFeatures;
+using Moq;
+using NUnit.Framework;
+using Umbraco.Cms.Core.Cache;
+using Umbraco.Cms.Core.Security;
+using Umbraco.Cms.Core.Web;
+using Umbraco.Cms.Web.Website.Cache.PartialViewCacheInvalidators;
+using Umbraco.Extensions;
+
+namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Web.Website.Routing;
+
+[TestFixture]
+public class MemberPartialViewCacheInvalidatorTests
+{
+    [Test]
+    public void ClearPartialViewCacheItems_Clears_ExpectedItems()
+    {
+        var runTimeCacheMock = new Mock<IAppPolicyCache>();
+        runTimeCacheMock
+            .Setup(x => x.ClearByRegex(It.IsAny<string>()))
+            .Verifiable();
+        var appCaches = new AppCaches(
+            runTimeCacheMock.Object,
+            NoAppCache.Instance,
+            new IsolatedCaches(type => new ObjectCacheAppCache()));
+        var memberPartialViewCacheInvalidator = new MemberPartialViewCacheInvalidator(appCaches);
+
+        var memberIds = new[] { 1, 2, 3 };
+
+        memberPartialViewCacheInvalidator.ClearPartialViewCacheItems(memberIds);
+
+        foreach (var memberId in memberIds)
+        {
+            var regex = $"Umbraco.Web.PartialViewCacheKey.*-m{memberId}-*";
+            runTimeCacheMock
+                .Verify(x => x.ClearByRegex(It.Is<string>(x => x == regex)), Times.Once);
+        }
+    }
+
+    [Test]
+    public async Task ClearPartialViewCacheItems_Regex_Matches_CachedKeys()
+    {
+        const int MemberId = 1234;
+
+        var memberManagerMock = new Mock<IMemberManager>();
+        memberManagerMock
+            .Setup(x => x.GetCurrentMemberAsync())
+            .ReturnsAsync(new MemberIdentityUser { Id = MemberId.ToString() });
+
+        var cacheKey = await HtmlHelperRenderExtensions.GenerateCacheKeyForCachedPartialViewAsync(
+            "TestPartial.cshtml",
+            true,
+            Mock.Of<IUmbracoContext>(),
+            true,
+            memberManagerMock.Object,
+            new TestViewModel(),
+            new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary()),
+            null);
+        cacheKey = CoreCacheHelperExtensions.PartialViewCacheKey + cacheKey;
+        Assert.AreEqual("Umbraco.Web.PartialViewCacheKeyTestPartial.cshtml-en-US-0-m1234-", cacheKey);
+
+        var regexForMember = $"Umbraco.Web.PartialViewCacheKey.*-m{MemberId}-*";
+        var regexMatch = Regex.IsMatch(cacheKey, regexForMember);
+        Assert.IsTrue(regexMatch);
+
+        var regexForAnotherMember = $"Umbraco.Web.PartialViewCacheKey.*-m{4321}-*";
+        regexMatch = Regex.IsMatch(cacheKey, regexForAnotherMember);
+        Assert.IsFalse(regexMatch);
+    }
+
+    private class TestViewModel
+    {
+    }
+}