What this PR does / why we need it:
: Fixes organization pagination conflict when importing realms with more than 10 organizations.

Which issue this PR fixes fixes #1493

Screenshots / logs (if relevant):

Special notes for your reviewer:

• Pagination implementation follows the same pattern as ClientRepository.findAll()
• Uses page size of 100 for consistency with other repositories
• Replaces deprecated .getAll() with paginated .list(firstResult, maxResults)
• No breaking changes - maintains existing API while fixing the underlying pagination issue

PR Readiness Checklist:

• Code follows project style guidelines
• Added tests that prove the fix is effective
• No checkstyle violations

Complete these before marking the PR as ready to review:

• tests pass locally (mvn test or relevant subset)
• added/updated tests for the changes (if applicable)
• documentation has been updated (if applicable)
• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR