⚠️ Remove metal3datatemplate template reference

[peppi-lotta]

What this PR does / why we need it: This reverts #184 #190 and any other mention of the templateReference. It's unclear if there is any use cases for templateReference. If there are none it should be deleted.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes # #1357

[metal3-io-bot]

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[peppi-lotta]

/test metal3-ubuntu-e2e-feature-test-main-remediation metal3-centos-e2e-feature-test-main-remediation

[metal3-io-bot]

@peppi-lotta: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
metal3-centos-e2e-feature-test-main-remediation	bdf965d	link	false	/test metal3-centos-e2e-feature-test-main-remediation
metal3-ubuntu-e2e-feature-test-main-remediation	bdf965d	link	false	/test metal3-ubuntu-e2e-feature-test-main-remediation

Full PR test history. Your PR dashboard.

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[metal3-io-bot]

@peppi-lotta: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
metal3-centos-e2e-feature-test-main-remediation	bdf965d	link	false	/test metal3-centos-e2e-feature-test-main-remediation
metal3-ubuntu-e2e-feature-test-main-remediation	bdf965d	link	false	/test metal3-ubuntu-e2e-feature-test-main-remediation

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.