improve(deeplink): support utf16 tags and IDs (via #4921)

* ref #3958, support utf16 fragments on the deeplink plugin
* put -> head for UTF16 operation
this is a temporary fix, eventually we will run out
of methods and need to use a new targeting strategy
* drop obsolete %20 decoder
* add full test suite for UTF16 operation
* use encodeURIComponent when setting hash
* drop obsolete test cases

test/e2e-cypress/static/documents/features/deep-linking.openapi.yaml

@@ -25,6 +25,14 @@ paths:
             application/json:
               schema:
                 type: object
+  /utf16fragments:
+    head:
+      operationId: "пошел"
+      tags: ["шеллы"]
+      summary: an operation
+      responses:
+        "200":
+          description: ok
   /withUnderscores:
     patch:
       operationId: "underscore_Operation"

test/e2e-cypress/static/documents/features/deep-linking.swagger.yaml

@@ -17,6 +17,10 @@ paths:
       responses:
         "200":
           description: ok
+  /utf16fragments:
+    head:
+      operationId: "пошел"
+      tags: ["шеллы"]
   /withUnderscores:
     patch:
       operationId: "underscore_Operation"
@@ -28,7 +32,3 @@ paths:
   /noOperationId:
     put:
       tags: ["tagTwo"]
-      summary: an operation
-      responses:
-        "200":
-          description: ok