PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.
• Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/tools/notes/WritingUnitTests.md.

What is the current behavior?

All Android Label's defaulted to vertical-align top which never matched iOS. This has been broadly complained about and a PR was even submitted by an excellent contributor @Logikgate #8216 which properly addressed the issue but was closed years ago citing breaking changes.

What is the new behavior?

All Android Label's will default to vertical-align middle now to match iOS default. This is a long desired breaking change.

closes #3829
References:
#5977
#8216
https://github.com/orgs/NativeScript/discussions/10058

BREAKING CHANGES:

All Android Label's will default to vertical-align middle now to match iOS default. If you preferred the previous default top, you can just explicitly set it.