Allow using simple queue names in aws sqs scaler

[nicolaferraro]

AWS SQS autoscaler does not really need a full queueURL, it also works with simple queue names, but there was some code that tried to parse the URL to get the queue name for building a metric ID.

The example in the doc already uses a simple name.

Checklist

• Commits are signed with Developer Certificate of Origin (DCO - learn more)
• Tests have been added
• A PR is opened to update our Helm chart (repo) (if applicable, ie. when deployment manifests are modified)
• A PR is opened to update the documentation on (repo) (if applicable)
• Changelog has been updated

Fixes #

[JorTurFer]

Hi @nicolaferraro ,
Have you tried this? I feel that the PR will not work with simple queues because the function GetAwsSqsQueueLength still uses queueURL but probably I'm wrong (I don't know in depth about AWS SDK)

[tomkerkhove]

I see you've checked " A PR is opened to update the documentation on (repo) (if applicable)" but I don't see a PR on https://github.com/kedacore/keda-docs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-desc. Would you mind updating the docs for 2.6 please?

[nicolaferraro]

Yes, I thought it wasn't required, but I've opened this: kedacore/keda-docs#628.

Sure, I've tested it manually and using the new integration I've created in Camel K.

[JorTurFer]

LGTM!
Thanks for your contribution ❤️

[tomkerkhove]

Added concern on doc PR given we are re-using the queueURL name for a queue name: kedacore/keda-docs#628 (comment)

Pending comments about naming in docs

[zroubalik]

LGTM, thanks!