[Testing] Fix for UITest Catalyst screenshot dimension inconsistency and image cropping issue

[anandhan-rajagopal]

Description

This PR removes the previous workaround for handling Mac Catalyst screenshots in full-screen mode, as the underlying screenshot capture mechanism has been improved.

Issue

Screenshot verification tests for Mac Catalyst were inconsistent due to some test cases running in full-screen mode while others didn't. This was happening because:

1. App.EnterFullScreen was called in one of the ScrollView test cases.
2. Subsequent test cases continued to run in full-screen mode.
3. In full-screen mode (1920x1051), screenshots were cropped at the top, leading to missing UI content (https://github.com/dotnet/maui/pull/28495/files#diff-5ae4a689264bc7e948ca6805e6e36cacd196a31179aa3e53d3ce1fa82f1a2605 )
4. This led to inconsistent screenshots with cropped top content for several control categories:
   • ScrollView, SearchBar, Shape, Slider, SoftInput, Stepper, Switch, SwipeView

Solution

• Removed the conditional workaround in the ScrollViewUITest method that handled full-screen screenshots. The workaround was originally introduced to adjust for content cropping caused by full-screen dimensions. With the updated screenshot mechanism, this workaround is no longer necessary.
• Screenshots now have consistent dimensions (789x563) across test runs.
• This change also resolves the content cropping issue previously observed with dimensions of 1920x1051.

[Copilot]

Pull Request Overview

This PR removes the legacy workaround for handling Mac Catalyst full-screen mode in the ScrollView UI tests. The changes aim to improve screenshot consistency by eliminating the conditional full-screen mode code.

• Removed conditional full-screen mode adjustments in three test methods.
• Ensured tests now rely on the updated screenshot capture mechanism.

Comments suppressed due to low confidence (1)

src/Controls/tests/TestCases.Shared.Tests/Tests/ScrollViewUITests.cs:24

• Ensure that the removal of the full-screen workaround is fully validated by updated CI screenshots, as the tests now rely on the updated screenshot mechanism to maintain consistent dimensions.

#if MACCATALYST

[rmarinho]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/azp run MAUI-UITests-public

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Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).