migrate Configuration usage to Settings

[bobheadxi]

closes https://github.com/sourcegraph/sourcegraph/issues/10419

looks like ConfigurationSubject was removed a while back, and SettingsSubject has replaced it

SettingsSubject is something that can have settings: a site ("global settings", which is different from "site configuration"), an organization, or a user.

go build ./cmd/src
./src config list
./src config get

a variety of other Configuration-related fields have been listed as deprecated, so I've gone ahead and migrated them to use Settings

[mrnugget]

Approve to unblock, but I think before you merge, you should rename the other variable names too so they reflect the new state.

[mrnugget]

To avoid others being confused by this in the future, let's make the naming consistent 🙂

Suggested change

	fragment ConfigurationSubjectFields on SettingsSubject {
	fragment SettingsSubjectFields on SettingsSubject {

[bobheadxi]

I dug a bit deeper and the changes turned out to be pretty far-reaching - all the Configuration fields are listed as deprecated, and the shape of some things have changed, so I went ahead and made everything Settings: 9a39f3e

[emidoots]

Nice work!

[emidoots]

Once you merge, please create a release following these instructions: https://github.com/sourcegraph/src-cli/blob/master/DEVELOPMENT.md#releasing

[mrnugget]

Good stuff, thanks @bobheadxi!