[5.1] Merge update parameter and improve contrain checker

[bembelimen]

Pull Request for Issue #43100 .

Summary of Changes

With TUF testing channel is not needed anymore and should use the TUF behaviour. Also allow now explicit testing for "default" and "next"

Testing Instructions

• Install Beta 1
• Apply patch to beta 1
• Go to joomla updater
• Go to options and select "default" + "beta" for stability level
• Update

Actual result BEFORE applying this Pull Request

Options not there, update does not work

Expected result AFTER applying this Pull Request

Update works

[brianteeman]

Should the code comments here be updated to include "testing"

joomla-cms/administrator/components/com_joomlaupdate/src/Model/UpdateModel.php

Line 107 in ea1b3fb

* The commented "case" below are for documenting where 'default' and legacy options falls

[MacJoom]

I have tested this item ✅ successfully on ea1b3fb

From a 5.1 Beta 1 Installation. Without the patch i have the message 'This site can't be updated to Joomla 5.1.0-beta2 .... doesn't meet the minimum requirements...' - with the patch it works!

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[dautrich]

I have tested this item ✅ successfully on ea1b3fb

Same behavior as described by @MacJoom

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[richard67]

RTC as this PR has 2 successful human tests. But it needs more fixes for the updater when using TUF. E.g. the channel ("5.x" or "6.x" depending on Default or Next update source) currently is currently not checked, as far as I can see, and there is one more place where we should use the minimumStability parameter independently from the selected update channel as suggested with my PR for this PR.

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43147.}

[MacJoom]

I have tested both "default" and "next" channel. With the patch it works as expected for both channels. It gives different messages depending on the channel set. "next" channel offers the update to 5.1 beta 2.

[LadySolveig]

Thank you @bembelimen and for support to @richard67 and also for testing @MacJoom and @dautrich