Added deserialization unit tests to CodeDomComponentSerializationService

[Rabina4363sf]

Fixes #10135

Proposed changes

• Added 20 comprehensive unit tests for CodeDomComponentSerializationService.Deserialize() method
• Tests cover null store and container parameter validation
• Tests verify single and multiple object deserialization scenarios
• Tests ensure round-trip serialization/deserialization preserves object state
• Tests validate empty store handling
• Tests cover DeserializeTo() method with various flag combinations (validateRecycledTypes, applyDefaults)
• Tests include integration with IServiceProvider and IContainer
• Tests verify proper exception handling for invalid operations

Customer Impact

• Improves test coverage for component serialization service
• Ensures deserialization APIs work reliably across different scenarios
• Validates serialization/deserialization round-trip fidelity

Regression?

• No

Risk

• Low (tests only, no product code changes)

Test methodology

• Unit tests using xUnit framework
• Mock objects created with Moq for isolated testing
• Validation of exception types and messages
• Property assertion checks for deserialized objects
• Control round-trip testing to verify state preservation
• Empty and edge-case scenarios covered

Accessibility testing

NA

Test environment(s)

• Visual Studio (Test Explorer)
• Windows
• .NET 11

Microsoft Reviewers: Open in CodeFlow