Fix BottomSheet bottom bar automation IDs

[Vetle444]

Description of Change

Fixes BottomSheet bottom bar button AutomationId handling so DUI no longer overwrites IDs supplied by consumers.

Why: MAUI only allows Element.AutomationId to be set once. Arena Mobil sets explicit automation IDs on bottom bar buttons, and BottomSheet.CreateBottomBar() later reassigned DUI-generated IDs while opening the sheet. That caused AutomationId may only be set one time, especially for sheets using ShowBottombarButtonsOnSubViews="True".

The bottom bar now generates DUI.BottomSheet.BottomBarButton{index} only when the button has no AutomationId, preserving consumer-provided IDs. A regression unit test verifies both preserved IDs and fallback generated IDs.

Verification:

• dotnet test src/tests/unittests/DIPS.Mobile.UI.UnitTests.csproj --no-restore --filter FullyQualifiedName~BottomSheetTests --logger "console;verbosity=minimal"

Documentation:

• No wiki update needed; this is a bug fix that preserves intended consumer behavior and does not add or change public API.

Todos

• I have tested on an Android device.
• I have tested on an iOS device.
• I have supported accessibility

[Copilot]

Pull request overview

Fixes a MAUI AutomationId re-assignment issue in BottomSheet.CreateBottomBar() by only generating DUI automation IDs for bottom bar buttons that don’t already have a consumer-provided AutomationId. This prevents runtime exceptions (AutomationId may only be set one time) in scenarios where consumers pre-set IDs and the bottom bar is created later (e.g., with ShowBottombarButtonsOnSubViews="True").

Changes:

• Updated BottomSheet.CreateBottomBar() to preserve existing AutomationId values and only generate fallback IDs when AutomationId is null.
• Added a regression unit test to verify both preservation of consumer IDs and generation of fallback DUI IDs.
• Added a patch entry to CHANGELOG.md describing the fix.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

📁 File summary (3 files changed)

File	Description
src/library/DIPS.Mobile.UI/Components/BottomSheets/BottomSheet.cs	Guarded AutomationId assignment so consumer-provided IDs aren’t overwritten.
src/tests/unittests/Components/BottomSheets/BottomSheetTests.cs	Regression test verifying preserved consumer IDs and generated fallback DUI IDs.
CHANGELOG.md	Added 62.0.1 entry documenting the BottomSheet automation ID fix.