Add config templates and use-template.sh for common deployment scenarios

[elfosardo]

Add pre-built configuration templates under config-templates/ covering IPI (ipv4, ipv6, dualstack, compact) and agent-based (SNO, HA, compact) deployments. Templates only set values that override defaults, so they stay minimal and don't drift as defaults change.

The use-template.sh helper copies a template to config_$USER.sh and preserves the CI_TOKEN across template switches.

[openshift-ci]

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[elfosardo]

/cc @tdomnesc @honza @hroyrh @andfasano

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[hroyrh]

Looks good.
/lgtm

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@hroyrh: changing LGTM is restricted to collaborators

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In response to this:

Looks good.
/lgtm

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[elfosardo]

/retest

[openshift-ci]

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

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-metal-ipi-ovn-ipv4	ff59338	link	true	/test e2e-metal-ipi-ovn-ipv4

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