Source Mailchimp: enable high test strictness level in SAT

[alafanechere]

What

A test_strictness_level field was introduced to Source Acceptance Tests (SAT).
Mailchimp is a generally_available connector, we want it to have a high test strictness level.

This will help:

• maximize the SAT coverage on this connector.
• document its potential weaknesses in term of test coverage.

How

1. Migrate the existing acceptance-test-config.yml file to the latest configuration format. (See instructions here)
2. Enable high test strictness level in acceptance-test-config.yml. (See instructions here)

⚠️ ⚠️ ⚠️
If tests are failing please fix the failing test by changing the acceptance-test-config.yml file or use bypass_reason fields to explain why a specific test can't be run.

Please open a new PR if the new enabled tests help discover a new bug.
Once this bug fix is merged please rebase this branch and run /test again.

You can find more details about the rules enforced by high test strictness level here.

Review process

Please ask the connector-operations teams for review.

[alafanechere]

/test connector=connectors/source-mailchimp

🕑 connectors/source-mailchimp https://github.com/airbytehq/airbyte/actions/runs/3435013867
❌ connectors/source-mailchimp https://github.com/airbytehq/airbyte/actions/runs/3435013867
🐛 https://gradle.com/s/6h6tmdez3zn26

Build Failed

Test summary info:

=========================== short test summary info ============================
ERROR test_incremental.py::TestIncremental - Failed: TestIncremental.test_two...
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
=============================== 1 error in 1.03s ===============================

[davydov-d]

Implemented here