Kafka Scaler: add back strings.TrimSpace() function for saslAuthType

[dttung2905]

Hi team,
This PR aims to fix #4689. Not sure it could be backported to 2.10. Please advise me on this matter. 🙏

Checklist

• When introducing a new scaler, I agree with the scaling governance policy
• I have verified that my change is according to the deprecations & breaking changes policy
• Tests have been added
• Changelog has been updated and is aligned with our [changelog requirements] (https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md#Changelog) (will update after given the LGTM from maintainers)
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[JorTurFer]

Nice fix!
Could you update the changelog as well?

[dttung2905]

@JorTurFer Thanks for the quick review ! Should I put the changelog under the unreleased or can we backport to 2.10.1 as some users have reported this issue 🤔 ?

[JorTurFer]

@JorTurFer Thanks for the quick review ! Should I put the changelog under the unreleased or can we backport to 2.10.1 as some users have reported this issue 🤔 ?

I think that under Unreleased -> Fixes is the best place.
Don't worry about v2.10.1, if we backport the fix, we will reorganize during the release process, but I don't think that we will do it because v2.11 will be released next week

[JorTurFer]

/run-e2e kafka
Update: You can check the progress here

[JorTurFer]

LGTM!
Thanks for the fix 🙇