[4.3][csp] Remove inline onclick from the Help button

[dgrammatiko]

Pull Request for Issue # .

Summary of Changes

• Deprecate Joomla.popupWindow
• Use data attributes to pass the data from PHP to JS
• Add the required onclick functionality based on the data attributes

Testing Instructions

This pr needs npm ci

Check any page on the backend with a help button that when clicking on it the help window opens as expected

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

Where do we register the deprecations?

[Quy]

I have tested this item ✅ successfully on e1e6e6e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39727.}

[viocassel]

I have tested this item ✅ successfully on e1e6e6e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39727.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39727.}

[obuisard]

Thank you Dimitris @dgrammatiko !

[heelc29]

@dgrammatiko @viocassel @Quy
Are you sure this is working? If I click the help button then it will open this url (notice the escaped slashes)

the Microsoft Edge (Version 111.0.1661.54) the second one is replaced to two slashes

and I will be redirected to the Main Page

Without this PR the url is correct (but not working at the moment for J4.3)

[brianteeman]

The 404 is because @obuisard hasnt set uip the proxy

[dgrammatiko]

@heelc29 check #40270

[obuisard]

We are working with the documentation team to resolve the missing docs for 4.3.