@override not work with `label` for progressive overriding

[metrue]

Issue Description

I trying to move one of my entities from a subgraph to another subgraph, I tried to leverage this progressive overriding to shift the traffic gradually, but the result observed,

• When no label applied, the overriding field will always be resolved in the new subgraph
• When label applied, the overriding field will always be resolved in the old subgraph

Link to Reproduction

https://github.com/apollographql/federation/pull/2978

Reproduction Steps

This CI of that PR includes the reproducible cases.

[dariuszkuc]

Hello 👋 Progressive @overrides are router only features and we don't support it on the gateway.

[metrue]

@dariuszkuc Thanks for the information, so sad to heard that.

Not sure how is the effort, but I kinda interested to make it available on gateway.