feat(tests): [nan-1763] add xero tests and adjust vitest

[khaliqgant]

Describe your changes

Add xero tests. Improve types and remove object casting.

Issue ticket number and link

NAN-1763

Checklist before requesting a review (skip if just adding/editing APIs & templates)

• I added tests, otherwise the reason is:
• External API requests have retries
• Pagination is used where appropriate
• The built in nango.paginate call is used instead of a while (true) loop
• Third party requests are NOT parallelized (this can cause issues with rate limits)
• If a sync requires metadata the nango.yaml has auto_start: false
• If the sync is a full sync then track_deletes: true is set

[linear]

NAN-1763 Add tests to more integration templates

[TBonnin]

lgtm
I have only skimmed through the test data. How do we make sure we don't leak any private info in those test files?

[khaliqgant]

lgtm I have only skimmed through the test data. How do we make sure we don't leak any private info in those test files?

We don't unfortunately. Open to suggestions for this. In this case I created test data intentionally so it was all fake.