fix(testy): improve testing flow

[simonvadee]

Description

Fix many small issues on e2e tests:

• timeout was not taken into account (and batch is deleted if timeout is exceeded)
• if the source already exist before importing, tests fail. I removed the source before importing it.
• there was not resource yielding failures in the mimic mapping. I added a erroneous mapping (patient_bad_gender) to test the failed_counters mechanism.
• env variables to update mimic credentials were not taken into account (see https://github.com/arkhn/deployment/pull/454)

Definition of Done

• [x] I followed the Arkhn Code Book (I swear!).
• [x] I have written tests for the code I added or updated.
• [ ] I have updated the documentation according to my changes.
• [x] I have updated the deployment configuration if needed.

Tests

Launched e2e tests mulltiple times on testy