[4.4] Fix finder helper addContentType duplicate entry for key 'title'

[Fedik]

Pull Request for Issue # .

Summary of Changes

When Finder helper trying to add a new content type it ignores already added types.
This leads to duplicated entry error.

Testing Instructions

Run following code anywhere:

$name = uniqid(); // Imitating a new content type name, can be any string
var_dump(Joomla\Component\Finder\Administrator\Indexer\Helper::addContentType($name, ''));
var_dump(Joomla\Component\Finder\Administrator\Indexer\Helper::addContentType($name, ''));

Actual result BEFORE applying this Pull Request

An error Duplicate entry 'xxxxx' for key 'xxxx.title'

Expected result AFTER applying this Pull Request

No error, the method return the same ID

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

[exlemor]

I have tested this item ✅ successfully on 7b1dfd4

@Fedik, I have successfully tested this in Joomla 4.4.4 (as well as Joomla 5.1.0 as well)

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[viocassel]

I have tested this item ✅ successfully on 7b1dfd4

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[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43053.}