[AWS CIS] Change logging non blocking errors to warning

[romulets]

The changed log lines are over alerting right now, it should be a warn instead of error

[mergify]

This pull request does not have a backport label. Could you fix it @romulets? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[amirbenun]

Let's have more clarity on the errors that are returned from AWS SDK.

[amirbenun]

Instead of strings comparison

	var nsb *types.NoSuchBucket
	if errors.As(err, &nsb) {
		p.log.Warnf("Error getting bucket %s for bucket %s: %v", operation, bucketName, err)
		return
	}

[romulets]

Done

[amirbenun]

Nice!