[5.4] Add missing page parameter to contentEventArguments - Article Module

[LadySolveig]

Pull Request resolves # .

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

The AI took the fun approach here #47467 when generating the test plugin by pointing out that the page argument is missing, resulting in inconsistent test results for the legacy modules compared to the new article module.

if ($event->getPage() !== null) {
    return;
}

This would work at the moment in the new Article Module, but nowhere else as all others have an offset or 0 default.
As it is more consistent with the rest of the codebase to include the page argument and give it value 0 instead of null as we do everywhere else, here is the PR for that.

Testing Instructions

Code Review

Actual result BEFORE applying this Pull Request

Unconsistent

Expected result AFTER applying this Pull Request

Consistent

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[ramalama]

I have tested this item ✅ successfully on a7fe11e

Test via Code Review successful

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/47476.}