fix duplicated shadow dom (#1095)

* fix: duplicated elements in shadow doms

clean observers before taking new full snapshots

* add checker for replayer to make it stable when data has duplicated nodes

* apply review suggestions

* add change log

* Apply formatting changes

* update prettier to fit the master branch

---------

Co-authored-by: Mark-Fenng <Mark-Fenng@users.noreply.github.com>

packages/rrweb/package.json

@@ -53,7 +53,6 @@
     "@types/jest-image-snapshot": "^5.1.0",
     "@types/node": "^17.0.21",
     "@types/offscreencanvas": "^2019.6.4",
-    "@types/prettier": "^2.3.2",
     "@types/puppeteer": "^5.4.4",
     "construct-style-sheets-polyfill": "^3.1.0",
     "cross-env": "^5.2.0",
@@ -65,7 +64,6 @@
     "jest": "^27.5.1",
     "jest-image-snapshot": "^5.2.0",
     "jest-snapshot": "^23.6.0",
-    "prettier": "2.2.1",
     "puppeteer": "^11.0.0",
     "rollup": "^2.68.0",
     "rollup-plugin-esbuild": "^4.9.1",