Require type for oneOf mutual exclusion

Author: Namnamseo

jsonschema/golangci.jsonschema.json

@@ -3846,7 +3846,8 @@
                 {
                   "properties": {
                     "type": {"enum": ["module"] }
-                  }
+                  },
+                  "required": ["type"]
                 },
                 {
                   "required": ["path"]

jsonschema/golangci.next.jsonschema.json

@@ -3846,7 +3846,8 @@
                 {
                   "properties": {
                     "type": {"enum": ["module"] }
-                  }
+                  },
+                  "required": ["type"]
                 },
                 {
                   "required": ["path"]

test/testdata/configs/custom_linter_goplugin.yml

@@ -0,0 +1,8 @@
+linters-settings:
+  custom:
+    foo:
+      type: "goplugin"
+      path: "bin/linter/myplugin.so"
+      description: I am a Go plugin system-based custom linter.
+      settings:
+        message: hello

test/testdata/configs/custom_linter_module.yml

@@ -0,0 +1,7 @@
+linters-settings:
+  custom:
+    foo:
+      type: "module"
+      description: I am a module-based custom linter.
+      settings:
+        message: hello

test/testdata/configs/custom_linter_notype.yml

@@ -0,0 +1,9 @@
+linters-settings:
+  custom:
+    foo:
+      path: "bin/linter/myplugin.so"
+      description: >
+        I didn't specify the type, so I am a Go plugin system-based custom linter.
+        As such, I need to be specified the path.
+      settings:
+        message: hello