feat: migrate tableExists to typescript

[lohart13]

Pull Request Checklist

• Have you added new tests to prevent regressions?
• If a documentation update is necessary, have you opened a PR to the documentation repository?
• Did you update the typescript typings accordingly (if applicable)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• Does the name of your PR follow our conventions?

Description Of Change

Migrates tableExists and tableExistsQuery to typescript.

For some reason the foreign key check in the alter method for the Model class needed to have the tableCatalog condition updated so that it only checks the value is its returned by the getForeignKeyReferencesForTable query.

Todos

• Rebase once fix(db2): use docker compose & set default schema as username #16307 has been merged to fix db2 errors.

[lohart13]

The db2 tests won't pass until #16307 has been merged as this PR updates the default schema value which is need for the queries to be correct.