This reverts commit 62365880b4. The unit tests showed that the text2string function completely undid the XSS fix, so it was always unsafe to use it. Also the logic simplifications were smaller then expected.
- added tests for all 4 cases: output to string or into element vs first param contains link or not
- cleaned up logic - skip HTML entity encoding only if we can ensure insertion to text node / when output to string, we always encode
- DOMpurify sanitizes gopher, ws & wss links, which we previosly had tested for
