Add tests for application parameter registration

Implemented two new test methods in `RegisterParameterTests.cs`:
- `RegisterApplicationParameterTest`: Verifies correct registration of application parameters with specific environment names.
- `RegisterApplicationEncryptedParameterTest`: Ensures encrypted application parameters are registered correctly.

Both methods are marked with `[DoNotParallelize]` for test execution control.

Author: gravity-api

src/G4.UnitTests/Plugins.Common/RegisterParameterTests.cs

@@ -44,6 +44,7 @@ public override void ManifestComplianceTest()
             AssertManifest<RegisterParameter>();
         }
 
+        [DoNotParallelize]
         [TestMethod(displayName: "Verify that the application parameter is registered " +
             "correctly with a specific environment name.")]
         public void RegisterApplicationParameterTest()
@@ -75,6 +76,7 @@ public void RegisterApplicationParameterTest()
             Assert.IsTrue("Bar Foo".Equals(actual.ConvertFromBase64(), Comparison));
         }
 
+        [DoNotParallelize]
         [TestMethod(displayName: "Verify that the encrypted application parameter is registered " +
             "correctly with a specific environment name.")]
         public void RegisterApplicationEncryptedParameterTest()