[PM-31052][PM-32469] Add V2UpgradeToken for key rotation without logout (#6995)

* User V2UpgradeToken for key rotation without logout

* reset old v2 upgrade token on manual key rotation

* sql migration fix

* missing table column

* missing view update

* tests for V2UpgradeToken clearing on manual key rotation

* V2 to V2 rotation causes logout. Updated wrapped key 1 to be a valid V2 encrypted string in tests.

* integration tests failures - increase assert recent for date time type from 2 to 5 seconds (usually for UpdatedAt assertions)

* repository test coverage

* migration script update

* new EF migration scripts

* broken EF migration scripts fixed

* refresh views due to User table alternation

test/Core.Test/KeyManagement/Models/Data/V2UpgradeTokenDataTests.cs

@@ -0,0 +1,57 @@
+using Bit.Core.KeyManagement.Models.Data;
+using Xunit;
+
+namespace Bit.Core.Test.KeyManagement.Models.Data;
+
+public class V2UpgradeTokenDataTests
+{
+    private static readonly string _mockEncryptedType2String =
+        "2.AOs41Hd8OQiCPXjyJKCiDA==|O6OHgt2U2hJGBSNGnimJmg==|iD33s8B69C8JhYYhSa4V1tArjvLr8eEaGqOV7BRo5Jk=";
+    private static readonly string _mockEncryptedType7String = "7.AOs41Hd8OQiCPXjyJKCiDA==";
+
+    [Fact]
+    public void ToJson_SerializesCorrectly()
+    {
+        var data = new V2UpgradeTokenData
+        {
+            WrappedUserKey1 = _mockEncryptedType7String,
+            WrappedUserKey2 = _mockEncryptedType2String
+        };
+
+        var json = data.ToJson();
+
+        var expected = $"{{\"WrappedUserKey1\":\"{_mockEncryptedType7String}\",\"WrappedUserKey2\":\"{_mockEncryptedType2String}\"}}";
+        Assert.Equal(expected, json);
+    }
+
+    [Fact]
+    public void FromJson_ValidJson_DeserializesCorrectly()
+    {
+        var json = $"{{\"WrappedUserKey1\":\"{_mockEncryptedType7String}\",\"WrappedUserKey2\":\"{_mockEncryptedType2String}\"}}";
+
+        var result = V2UpgradeTokenData.FromJson(json);
+
+        Assert.NotNull(result);
+        Assert.Equal(_mockEncryptedType7String, result.WrappedUserKey1);
+        Assert.Equal(_mockEncryptedType2String, result.WrappedUserKey2);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData("")]
+    [InlineData("   ")]
+    public void FromJson_NullOrEmptyInput_ReturnsNull(string? input)
+    {
+        var result = V2UpgradeTokenData.FromJson(input);
+
+        Assert.Null(result);
+    }
+
+    [Fact]
+    public void FromJson_InvalidJson_ReturnsNull()
+    {
+        var result = V2UpgradeTokenData.FromJson("{\"invalid\": json}");
+
+        Assert.Null(result);
+    }
+}