fix: Fix Combo Change event ChangeType enum not being decoded correctly.

[skrustev]

Description

• Fix wrong mapping for ChangeType property to WC property
• Fix enums converting from string not being case insensitive.

Type of Change (check all that apply):

• Bug fix
• New functionality
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes)
• Documentation
• Demos
• CI/CD
• Tests
• Changelog

Component(s) / Area(s) Affected:

Combo, event enums

How Has This Been Tested?

• Unit tests
• Manual testing
• Automated e2e tests

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code
• This PR includes API docs for newly added methods/properties
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes behavioral changes and the feature specification has been updated with them
• Accessibility (ARIA, keyboard navigation, focus management) has been verified

Closes #352

[Copilot]

Pull request overview

This PR fixes deserialization of the Combo Change event detail so Detail.ChangeType correctly reflects the underlying web component payload (notably for deselection), and updates enum parsing to be case-insensitive.

Changes:

• Remap IgbComboChangeEventArgsDetail.ChangeType event JSON decoding from changeType to the correct type key.
• Make StringToEnum<T> parsing case-insensitive to correctly handle lowercase event payload values (e.g., "deselection").
• Add unit tests validating ChangeType is received for both selection and deselection events.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/IgniteUI.Blazor.Tests/ComboTests.cs	Adds unit tests that assert the Combo Change event detail includes the expected ComboChangeType values.
src/componentsBase/BaseRendererControl.cs	Updates enum parsing to be case-insensitive to match event payload casing.
src/components/Blazor/ComboChangeEventArgsDetail.cs	Fixes inbound event JSON key mapping for ChangeType from changeType to type.

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