Apollo sandbox use query http headers to fetch the schema

[JuVincent]

Issue Description

Hello

I am developing an App with apollo gateway, i use Apollo sandbox to test my queries and mutations.

Sometimes i add an http headers on a query tab
Then when i want to refetch my schema, the refetch schema action has an unexpected behavior.
The action uses headers defines in the active query tab.

For me the refetch schema button should only used shared headers and not used specific http headers define in query tab

thanks for your answer

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Reproduction Steps

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