Improve the platform detection for HPA

[iblancasa]

While checking the problem described in #1418, we found the autodetection for HPA is not 100% correct.

The configuration is set as a value in the autoDetect struct (internal/config/main.go). So, if we copy an instance of the Config struct (like passing it by value in a method) and update the copy (from a different Goroutine for instance), the HPA value will not be reflected in the copy. This problem was solved previously for other components from Autodetect (#1206 (comment)).

To solve this problem, we can follow the same approach done for OpenShift Routes in #1463.

So, for instance, in the (c *Config) AutoDetect method, instead of:

	hpaVersion, err := c.autoDetect.HPAVersion()
	if err != nil {
		return err
	}
	c.autoscalingVersion = hpaVersion

We should do the same as we do for the OpenShift Routes:

	hpaV, err := c.autoDetect.HPAVersion()
	if err != nil {
		return err
	}
	if c.hpaVersion.Get() != hpaV {
		c.logger.V(1).Info("HPA version detected", "version", hpaV)
		c.hpaVersion.Set(hpaV)
		if err = c.onHPAVersion.Do(); err != nil {
			// Don't fail if the callback failed, as auto-detection itself worked.
			c.logger.Error(err, "configuration change notification failed for callback")
		}
	}