rcvOpampConnectionSettings doesn't report conn offer reject errors to Server

[srikanthccv]

The OnOpampConnectionSettings callback documents if the connection fails with the new setting, the offer will be rejected, and the error will be reported to Server.

opamp-go/client/types/callbacks.go

Lines 80 to 84 in 13a6fd1

	// If OnOpampConnectionSettings returns nil and then the caller will
	// attempt to reconnect to the OpAMP Server using the new settings.
	// If the connection fails the settings will be rejected and an error will
	// be reported to the Server. If the connection succeeds the new settings
	// will be used by the client from that moment on.

This rcvOpampConnectionSettings doesn't appear to report the error to Server here

opamp-go/client/internal/receivedprocessor.go

Lines 183 to 197 in 13a6fd1

	func (r *receivedProcessor) rcvOpampConnectionSettings(ctx context.Context, settings *protobufs.ConnectionSettingsOffers) {
	if settings == nil || settings.Opamp == nil {
	return
	}
	if r.hasCapability(protobufs.AgentCapabilities_AgentCapabilities_AcceptsOpAMPConnectionSettings) {
	err := r.callbacks.OnOpampConnectionSettings(ctx, settings.Opamp)
	if err == nil {
	// TODO: verify connection using new settings.
	r.callbacks.OnOpampConnectionSettingsAccepted(settings.Opamp)
	}
	} else {
	r.logger.Debugf("Ignoring Opamp, agent does not have AcceptsOpAMPConnectionSettings capability")
	}
	}