fix: remove zendesk

[nyujacky]

Merge checklist:
Check off if complete or not applicable:

• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post-merge:

• Backported to latest and next named releases

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
commerce_coordinator/apps/commercetools
utils.py
commerce_coordinator/apps/commercetools/sub_messages
tasks.py
commerce_coordinator/apps/commercetools/tests
test_utils.py
commerce_coordinator/apps/commercetools/tests/sub_messages
test_tasks.py
Project Total

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[grmartin]

This looks good, but you should also gut the config values and we need to remove the values from edx-internal as well...