[Dependency ownership] move enzyme to shared-ux (#200964)

## Summary

According to `Kibana Dependency ownership report` majority of React
dependencies are owned by `elastic/appex-sharedux` team.

We had a chat and agreed that it makes sense to change ownership for
React testing libraries like `enzyme` to `elastic/appex-sharedux` for
consistency (testing dependencies are usually updated together with
React ones)

Ownership report was updated.

renovate.json

@@ -137,15 +137,11 @@
       "groupName": "@elastic/appex-qa dependencies",
       "matchDepNames": [
         "cheerio",
-        "@types/enzyme",
         "@types/faker",
         "@types/pixelmatch",
         "@types/pngjs",
         "@types/supertest",
-        "@wojtekmaj/enzyme-adapter-react-17",
         "babel-plugin-istanbul",
-        "enzyme",
-        "enzyme-to-json",
         "faker",
         "nyc",
         "oboe",
@@ -175,10 +171,13 @@
       "matchDepNames": [
         "@elastic/filesaver",
         "@elastic/numeral",
+        "@wojtekmaj/enzyme-adapter-react-17",
         "base64-js",
         "blurhash",
         "classnames",
         "deep-freeze-strict",
+        "enzyme",
+        "enzyme-to-json",
         "fflate",
         "history",
         "lz-string",
@@ -188,6 +187,7 @@
         "@types/base64-js",
         "@types/classnames",
         "@types/deep-freeze-strict",
+        "@types/enzyme",
         "@types/history",
         "@types/lz-string",
         "@types/styled-components"