refactor: integration tests to use vitest instead jest

[LeonardoVieira1630]

Refactor Request

Describe the Refactor Request

In the integration tests branch, it was used jest. Otherwise, in some parts of the project, it is being used vitest, that is newer and more performative.
So, to make a more concise and more performative code, the integration tests need to be refactored.

Describe Preferred Solution

To complete the issue, the integration test needs to import vitest functions and definitions, like beforeAll, it and describe. None of jest definitions will be used after the modification.

Related Code

An example of test the is using the vitest already can be seen at: https://github.com/blockful-io/external-resolver/blob/integrationTests/packages/client/test/public.test.ts

Additional Context

vitest docs: https://vitest.dev/guide/

[pikonha]

is there a PR for this?