[5.2] Web Asset Manager incorect loading of external resource with / at the end

[Fedik]

Pull Request for Issue #44759 .

Summary of Changes

Fix for Web Asset Manager incorectly loading an external resource with / at the end

Testing Instructions

Add in to index.php of the site template:

$wa->registerAndUseScript('example.foobar', 'https://example.com/foobar/');
$wa->registerAndUseScript('example.esm', 'foobar/', ['importmap' => true]);

Open site page and check the source code, the header section with scripts.

Actual result BEFORE applying this Pull Request

The path for external script is incorrect, importmap works.

<script type="importmap">{"imports":{"example.esm":"/site-folder/foobar/"}}</script>
...
<script src="/blabla/site-folder/https://example.com/foobar/"></script>

Expected result AFTER applying this Pull Request

The path for external script is correct, importmap works

<script type="importmap">{"imports":{"example.esm":"/site-folder/foobar/"}}</script>
...
<script src="https://example.com/foobar/"></script>

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

[QuyTon]

I have tested this item ✅ successfully on aef35a9

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44774.}

[pe7er]

I have tested this item ✅ successfully on aef35a9

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44774.}

[pe7er]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44774.}