fix(ocm-add-share): adjust domain validation

[cristianscheid]

• Resolves: #

Summary

• adds validation for domains from owner or sharedBy fields and checks if they contain any suspicious characters, like letters which are almost identical visually but are Unicode characters from different sets (e.g. "micrоsoft.com" spelled with Cyrillic "о" character)

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI