[ci] Remove quick-benchmarks-omni from GitLab (#6014)
The `quick-benchmarks-omni` job was moved to GHA (can be found [here](https://github.com/paritytech/polkadot-sdk/blob/439b31ef/.github/workflows/check-frame-omni-bencher.yml#L22)) but hasn't been removed from GitLab . PR fixes it and makes the check required.
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