Add test coverage for non-success HTTP response scenarios in SendChatHistoryAsync

[Copilot]

Addresses missing test coverage for error handling in McpToolServerConfigurationService.SendChatHistoryAsync. The implementation logs errors for non-successful HTTP responses but lacked tests verifying this behavior.

Changes

• Added parameterized test covering HTTP error status codes: 400, 401, 403, 404, 500
• Verifies error logging includes correct status code text and method completes without throwing

[Theory]
[InlineData(HttpStatusCode.BadRequest, "BadRequest", "Invalid request format")]
[InlineData(HttpStatusCode.Unauthorized, "Unauthorized", "Unauthorized access")]
[InlineData(HttpStatusCode.Forbidden, "Forbidden", "Access forbidden")]
[InlineData(HttpStatusCode.NotFound, "NotFound", "Endpoint not found")]
[InlineData(HttpStatusCode.InternalServerError, "InternalServerError", "Internal server error")]
public async Task SendChatHistoryAsync_NonSuccessStatusCode_LogsErrorAndCompletesWithoutException(
    HttpStatusCode statusCode, string expectedStatusText, string errorMessage)

Tests validate the error handling code at lines 138-142 that logs non-successful responses without propagating exceptions.

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