fix(rulesets): avoid false errors from ajv (#2408)

* fix(rulesets): avoid false errors from ajv

This commit modifies the oasExample function so
that example fields are removed from the schema
to be used for validation.  This is needed because
the presence of an "example" field in a schema
confuses ajv in certain scenarios.
References:
- #2081
- #2140
- ajv-validator/ajv#1426

* docs(repo): fix lint warning in README

Signed-off-by: Phil Adams <[email protected]>

* chore(rulesets): use traverse

---------

Signed-off-by: Phil Adams <[email protected]>
Co-authored-by: Jakub Rożek <[email protected]>

package.json

@@ -39,7 +39,8 @@
     "test.karma": "karma start",
     "prepare": "husky install",
     "prerelease": "patch-package",
-    "release": "yarn prerelease && yarn workspaces foreach run release"
+    "release": "yarn prerelease && yarn workspaces foreach run release",
+    "jest": "jest"
   },
   "workspaces": {
     "packages": [