fix(ui-date-input): make DateInput2 date parsing work in every locale and timezone

[balzss]

INSTUI-4571

test plan:

• check all examples for dateinput2, they should work as expected
• input a date manually (with keyboard) for each example and blur the input -> it should parse the date successfully
• placeholder hints should not have any number in them, just D, M and Y letters
• use chrome devtools and change your location (3 dots -> more tools -> sensors -> location)
• check the component examples again with different locales
• check if manually changing locale and timezone works as expected

[github-actions]

PR Preview Action v1.6.1
Preview removed because the pull request was closed.
2025-06-03 15:00 UTC

[joyenjoyer]

tested all examples, worked fine, gj

[matyasf]

nice work, I could not find any bugs