[PM-22380] Enable NRT for some Core project files (#5912)

* Enable NRT for Core/Jobs files

* Enable NRT for Core/HostedServices files

* Enable NRT for Core/Exceptions files

* Enable NRT for Core/NotificationHub files

---------

Co-authored-by: Bernd Schoolmann <mail@quexten.com>

src/Core/Exceptions/BadRequestException.cs

@@ -3,6 +3,8 @@ using Microsoft.AspNetCore.Mvc.ModelBinding;
 
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class BadRequestException : Exception
 {
     public BadRequestException() : base()
@@ -41,5 +43,5 @@ public class BadRequestException : Exception
         }
     }
 
-    public ModelStateDictionary ModelState { get; set; }
+    public ModelStateDictionary? ModelState { get; set; }
 }

src/Core/Exceptions/ConflictException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class ConflictException : Exception
 {
     public ConflictException() : base("Conflict.") { }

src/Core/Exceptions/DnsQueryException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DnsQueryException : Exception
 {
     public DnsQueryException(string message)

src/Core/Exceptions/DomainClaimedException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DomainClaimedException : Exception
 {
     public DomainClaimedException()

src/Core/Exceptions/DomainVerifiedException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DomainVerifiedException : Exception
 {
     public DomainVerifiedException()

src/Core/Exceptions/DuplicateDomainException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class DuplicateDomainException : Exception
 {
     public DuplicateDomainException()

src/Core/Exceptions/FeatureUnavailableException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 /// <summary>
 /// Exception to throw when a requested feature is not yet enabled/available for the requesting context.
 /// </summary>

src/Core/Exceptions/GatewayException.cs

@@ -1,8 +1,10 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class GatewayException : Exception
 {
-    public GatewayException(string message, Exception innerException = null)
+    public GatewayException(string message, Exception? innerException = null)
         : base(message, innerException)
     { }
 }

src/Core/Exceptions/InvalidEmailException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class InvalidEmailException : Exception
 {
     public InvalidEmailException()

src/Core/Exceptions/InvalidGatewayCustomerIdException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class InvalidGatewayCustomerIdException : Exception
 {
     public InvalidGatewayCustomerIdException()

src/Core/Exceptions/NotFoundException.cs

@@ -1,5 +1,7 @@
 namespace Bit.Core.Exceptions;
 
+#nullable enable
+
 public class NotFoundException : Exception
 {
     public NotFoundException() : base()