[3.10] Show the target version to the pre upgrade checker

[zero-24]

Pull Request for Issue #31292

Summary of Changes

Show the target version to the pre upgeade checker

Testing Instructions

• install 3.10
• set the custom update server to: https://update.joomla.org/core/test/310to4_list.xml
• check the pre upgrade checker

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Documentation Changes Required

none

[ChristineWk]

I have tested this item ✅ successfully on 127958c

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[ChristineWk]

I have tested this item ✅ successfully on a41ed40

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/32098.}

[ghost]

I have tested this item ✅ successfully on a41ed40

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/32098.}

[richard67]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/32098.}

[richard67]

Thanks!