chore: Remove test_ssl_only test and related unused code

[bahaa-ghazal]

Ticket: QA-862

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[bahaa-ghazal]

@mender-test-bot start integration pipeline

[mender-test-bot]

Hello 😺 I created a pipeline for you here: Pipeline-2062017048

Build Configuration Matrix

Key	Value
INTEGRATION_REV	pull/2795/head
RUN_TESTS_FULL_INTEGRATION	true

[lluiscampos]

Thanks! I am happy to see this one cleaned up 🧹

I think that production/config/prod.yml.template, production/config/enterprise.yml.template, production/run and even the whole migration/ directory can be removed. The Mender Server team should now best.

[bahaa-ghazal]

@mender-test-bot start integration pipeline

[mender-test-bot]

Hello 😺 I created a pipeline for you here: Pipeline-2069186964

Build Configuration Matrix

Key	Value
INTEGRATION_REV	pull/2795/head
RUN_TESTS_FULL_INTEGRATION	true

[bahaa-ghazal]

@mender-test-bot start integration pipeline

[mender-test-bot]

Hello 😺 I created a pipeline for you here: Pipeline-2082901345

Build Configuration Matrix

Key	Value
INTEGRATION_REV	pull/2795/head
RUN_TESTS_FULL_INTEGRATION	true

[lluiscampos]

@bahaa-ghazal Thank you very much 🚀