Revert "Cody: add support for neovim, cody-cli, eclipse, and visualstudio clients (#63854)

This reverts commit 00d812c176.

The motivation to revert this commit is because it wasn't a good fix and
I want to have an easy-to-cherry-pick commit with a good fix (which I
have ready in another branch).

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## Test plan

Green CI.
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## Changelog

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cmd/frontend/internal/httpapi/completions/handler.go

@@ -561,10 +561,6 @@ func checkClientCodyIgnoreCompatibility(ctx context.Context, db database.DB, r *
 	}
 	var cvc clientVersionConstraint
 	switch clientName {
-	case types.CodyClientEclipse:
-	case types.CodyClientVisualStudio:
-	case types.CodyClientNeovim:
-	case types.CodyClientCli:
 	case types.CodyClientWeb:
 		// Cody Web is of the same version as the Sourcegraph instance, thus no version constraint is needed.
 		return nil
@@ -582,15 +578,7 @@ func checkClientCodyIgnoreCompatibility(ctx context.Context, db database.DB, r *
 		}
 	default:
 		return &codyIgnoreCompatibilityError{
-			reason: fmt.Sprintf("please use one of the supported clients: %s, %s, %s, %s, %s, %s, %s.",
-				types.CodyClientVscode,
-				types.CodyClientJetbrains,
-				types.CodyClientWeb,
-				types.CodyClientEclipse,
-				types.CodyClientCli,
-				types.CodyClientVisualStudio,
-				types.CodyClientNeovim,
-			),
+			reason:     fmt.Sprintf("please use one of the supported clients: %s, %s, %s.", types.CodyClientVscode, types.CodyClientJetbrains, types.CodyClientWeb),
 			statusCode: http.StatusNotAcceptable,
 		}
 	}

cmd/frontend/internal/httpapi/completions/handler_test.go

@@ -84,15 +84,7 @@ func TestCheckClientCodyIgnoreCompatibility(t *testing.T) {
 				"client-name": []string{"sublime"},
 			},
 			want: &codyIgnoreCompatibilityError{
-				reason: fmt.Sprintf("please use one of the supported clients: %s, %s, %s, %s, %s, %s, %s.",
-					types.CodyClientVscode,
-					types.CodyClientJetbrains,
-					types.CodyClientWeb,
-					types.CodyClientEclipse,
-					types.CodyClientCli,
-					types.CodyClientVisualStudio,
-					types.CodyClientNeovim,
-				),
+				reason:     fmt.Sprintf("please use one of the supported clients: %s, %s, %s.", types.CodyClientVscode, types.CodyClientJetbrains, types.CodyClientWeb),
 				statusCode: http.StatusNotAcceptable,
 			},
 		},

internal/completions/types/types.go

@@ -262,13 +262,9 @@ const (
 type CodyClientName string
 
 const (
-	CodyClientWeb          CodyClientName = "web"
-	CodyClientVscode       CodyClientName = "vscode"
-	CodyClientJetbrains    CodyClientName = "jetbrains"
-	CodyClientEclipse      CodyClientName = "eclipse"
-	CodyClientVisualStudio CodyClientName = "visualstudio"
-	CodyClientNeovim       CodyClientName = "neovim"
-	CodyClientCli          CodyClientName = "cody-cli"
+	CodyClientWeb       CodyClientName = "web"
+	CodyClientVscode    CodyClientName = "vscode"
+	CodyClientJetbrains CodyClientName = "jetbrains"
 )
 
 type CompletionRequest struct {