[Regression] Make a redirection optional for the menu item alias

[csthomas]

Pull Request for Issue #22432 (comment)

Summary of Changes

Restore the default behaviour of the menu item alias to Joomla before version 3.9

Redirection is now optional and will not work on POST request.

Testing Instructions

See comments at #22432

Expected result

See comments at #22432

Actual result

See comments at #22432

Documentation Changes Required

New language strings.

[sanderpotjer]

I have tested this item ✅ successfully on f354ab3

@csthomas great, thanks a lot! I confirm this is restoring the "old" behaviour, and makes the redirect optional. Template style is hiding nicely when redirect is set to Yes.

Thanks!

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[csthomas]

I have changed the order of conditions in the if statement so that I do not check the type of request in all requests.

[phproberto]

I have tested this item ✅ successfully on 83de6dd

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[sanderpotjer]

I have tested this item ✅ successfully on 83de6dd

Also after the latest commit, thanks!

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[infograf768]

RTC after 2 good tests.

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[csthomas]

I have created one more PR (#23294) to allow 3rd party extensions/custom code to create a SEF url for alias links (menu item alias)