TableView title issue fix on iOS and windows platforms.

[devanathan-vaithiyanathan]

Root cause

• On Windows, the TableSelection and TableRoot title properties were converted to lowercase using a converter.
• On iOS 14.0 and later, the table selection text logic was not implemented.

Description of Change

• Removed the converter from the TableSelection and TableRoot title properties on Windows.
• Implemented the table selection logic for iOS 14.0 and later.

Issues Fixed

Fixes #17123

Tested the behaviour in the following platforms

• [x] Android
• [x] Windows
• [x] iOS
• [x] Mac

Output Screenshot

Before	After
Windows	Windows
iOS	iOS

[dotnet-policy-service[bot]]

Hey there @devanathan-vaithiyanathan! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jsuarezruiz]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[Shalini-Ashokan]

/rebase

[jsuarezruiz]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

LGTM, tested en Android, iOS and Windows and with the changes, the TableView section header behavior is aligned.

[Shalini-Ashokan]

/rebase

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[Shalini-Ashokan]

@PureWeen, I removed the iOS changes, ensured that the PR only includes the WinUI changes.

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

• failing tests are unrelated