fix(admin): make config changes to pass through gog middlewares (#8014)

[joshua-goldstein]

Cherry pick from #8014

In #7955 the team made a change to the way lambda scripts were loaded into Dgraph. This PR had a small conflict with that PR. Any change related to #7955 should be made in another PR.

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[coveralls]

Coverage remained the same at 37.182% when pulling 7f18f85 on cherry-pick-8014 into b975b98 on main.

[MichelDiz]

@joshua-goldstein Please, sign the CLA.

FYI. Yes, we need getLambdaScript 100%. It is used in the cloud. If you remove it it will break the entire cloud.
What happened to make you wonder? Is it breaking some test? or CI?

[joshua-goldstein]

@joshua-goldstein Please, sign the CLA.

FYI. Yes, we need getLambdaScript 100%. It is used in the cloud. If you remove it it will break the entire cloud. What happened to make you wonder? Is it breaking some test? or CI?

@MichelDiz I have already signed the CLA, it is giving this message because this is a cherry pick from other commits that have other contributors.

To your main point: this is currently not in the main branch. See here. Presumably if we want to base the cloud on v22.0.1 we will have to bring in other changes not related to this PR.

[MichelDiz]

I see, yep they have changed a lot of places #7955
Also need to continue the change in the lambda repo.

In 21.03 (and previous versions) we stored the lambda scripts directly via flag in the binary. This change to GraphQL makes easy to deal with the JSscript(it is stored in bas64). This seemed obvious to me. It's a change from 16 months ago. I assumed it was already in effect.

As you can see, it is present in v21.09-slash(a cloud version) https://github.com/dgraph-io/dgraph/blob/release/v21.09-slash/graphql/admin/admin.go

[meghalims]

LGTM. Please merge this Josh