chore: rename git_auth to external_auth in our schema (#9935)

* chore: rename `git_auth` to `external_auth` in our schema

We're changing Git auth to be external auth. It will support
any OAuth2 or OIDC provider.

To split up the larger change I want to contribute the schema
changes first, and I'll add the feature itself in another PR.

* Fix names

* Fix outdated view

* Rename some additional places

* Fix sort order

* Fix template versions auth route

* Fix types

* Fix dbauthz

Makefile

@@ -542,12 +542,11 @@ site/src/api/typesGenerated.ts: scripts/apitypings/main.go $(shell find ./coders
 	cd site
 	pnpm run format:types ./src/api/typesGenerated.ts
 
-site/e2e/provisionerGenerated.ts:
+site/e2e/provisionerGenerated.ts: provisionerd/proto/provisionerd.pb.go
 	cd site
 	../scripts/pnpm_install.sh
 	pnpm run gen:provisioner
 
-
 examples/examples.gen.json: scripts/examplegen/main.go examples/examples.go $(shell find ./examples/templates)
 	go run ./scripts/examplegen/main.go > examples/examples.gen.json