fix: Include an error type in provider error events

[kinyoklion]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

OFP requirement 5.1.5 (sdk-specs OFP-openfeature-provider-behavior): PROVIDER_ERROR events SHOULD populate the event details' error code.

Describe the solution you've provided

StatusProvider.EmitProviderEvent sets ProviderEventPayload.ErrorType = ErrorType.General for ProviderEventTypes.ProviderError events (emitted when the LaunchDarkly data source is Off). Added ProviderTests.ItIncludesAnErrorTypeInErrorEvents.

Describe alternatives you've considered

A more specific type (e.g. ProviderFatal for 401/403) was not used; OFP does not define a mapping, and the Python provider already uses GENERAL for the same transition.

Additional context

Validated locally with dotnet test on net8.0 (69 passed).

Link to Devin session: https://app.devin.ai/sessions/929f5530882d40bc95e55391e97536d5
Open in Devin Desktop: https://app.devin.ai/desktop/session/929f5530882d40bc95e55391e97536d5?variant=devin
Requested by: @kinyoklion

SDK-3255

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Note

Overview
Aligns provider status error events with OpenFeature provider behavior (OFP 5.1.5) by populating the event’s error code when the provider reports an error.

StatusProvider.EmitProviderEvent now sets ProviderEventPayload.ErrorType to ErrorType.General whenever the event type is ProviderError (e.g. when status moves to Error/Fatal after the data source is Off). A new test drives a post-init data-source Off transition and asserts the emitted event is ProviderError with ErrorType.General.

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