Fix TimeZoneInfo.HasIanaId when using Local Time Zone

[tarekgh]

#58326

We have exposed the new property TimeZoneInfo.HasIanaId in .NET 6.0. This property tells if the Time Zone object is created with IANA Id. This property returns the correct results except when using TimeZoneInfo.Local. The reason is when we initialize TimeZoneInfo.Local property we clone the object before returning it, but we missed cloning HasIanaId property inside the returned object. The fix is to ensure HasIanaId is initialized correctly in TimeZoneInfo.Local.

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Issue Details

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#58326

We have exposed the new property TimeZoneInfo.HasIanaId in .NET 6.0. This property tells if the Time Zone object is created with IANA Id. This property returns the correct results except when using TimeZoneInfo.Local. The reason is when we initialize TimeZoneInfo.Local property we clone the object before returning it, but we missed cloning HasIanaId property in that object. The fix is to ensure HasIanaId is initialized correctly in TimeZoneInfo.Local.

Author:	tarekgh
Assignees:	-
Labels:	area-System.Globalization
Milestone:	-

[eerhardt]

The changes LGTM.

[tarekgh]

/backport to release/6.0

[github-actions]

Started backporting to release/6.0: https://github.com/dotnet/runtime/actions/runs/1184414702

[github-actions]

@tarekgh backporting to release/6.0 failed, the patch most likely resulted in conflicts:

$ git am --3way --ignore-whitespace --keep-non-patch changes.patch

Applying: Fix TimeZoneInfo.HasIanaId when using Local Time Zone
Applying: Add more test
error: sha1 information is lacking or useless (src/libraries/System.Runtime/tests/System/TimeZoneInfoTests.cs).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0002 Add more test
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!