fix: Check catalog name when looking for existing schemas

Problem

Adds catalog name to the filter when checking for existing schemas when creating a new schema.

What types of changes does your code introduce? Put an x in the boxes that apply

[x] Bugfix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Documentation Update (if none of the other choices apply)

[x] Description above provides context of the change
[x] I have added tests that prove my fix is effective or that my feature works
[x] Unit tests for changes (not needed for documentation changes)
[ ] CI checks pass with my changes
[ ] Bumping version in setup.py is an individual PR and not mixed with feature or bugfix PRs
[ ] Commit message/PR title starts with [AP-NNNN] (if applicable. AP-NNNN = JIRA ID)
[ ] Branch name starts with AP-NNN (if applicable. AP-NNN = JIRA ID)
[x] Commits follow "How to write a good git commit message"
[ ] Relevant documentation is updated including usage instructions