ascanrules: clean up sqli comments

[FiveOFive]

Overview

Cleaning up sql injection scan rule code ahead of making updates for false positives in zaproxy/zaproxy#8652 This change has no logic changes. It only removes old commented out code and cleans up a few other excessive comments such as commenting the end of loops. The goal is to improve readability of the code

Related Issues

Specify any related issues or pull requests by linking to them.

Checklist

• Update help
• Update changelog
• Run ./gradlew spotlessApply for code formatting
• Write tests
• Check code coverage
• Sign-off commits
• Squash commits
• Use a descriptive title

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[thc202]

There are some more comments that fall under the description that were not removed but less noise.

[thc202]

Thank you!

Ideally this should have been done as a commit in #5868. Now that one will have conflicts.