Add single team clause so feature gates align with enhancement guidance

[sdodson]

We generally want both featuregates and enhancements once multiple teams are pulled into the mix.

[sdodson]

/assign @deads2k

[openshift-ci]

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[openshift-bot]

Inactive enhancement proposals go stale after 28d of inactivity.

See https://github.com/openshift/enhancements#life-cycle for details.

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/lifecycle stale

[dustymabe]

/approve

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