Use randomly generated conference names for Jitsi

Fixes https://github.com/vector-im/element-web/issues/15205
Replaces https://github.com/matrix-org/matrix-react-sdk/pull/5322

This change uses a random ID for the Jitsi conference name to avoid any badly-named Jitsi calls, and overrides the "subject" (title) of the call so end users aren't typically exposed to the random ID.

yarn.lock

@@ -2477,11 +2477,6 @@ commander@^4.0.1:
   resolved "https://registry.yarnpkg.com/commander/-/commander-4.1.1.tgz#9fd602bd936294e9e9ef46a3f4d6964044b18068"
   integrity sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==
 
-commander@^6.1.0:
-  version "6.2.1"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-6.2.1.tgz#0792eb682dfbc325999bb2b84fddddba110ac73c"
-  integrity sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==
-
 commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
@@ -6453,14 +6448,6 @@ progress@^2.0.0:
   resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.3.tgz#7e8cf8d8f5b8f239c1bc68beb4eb78567d572ef8"
   integrity sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==
 
-project-name-generator@^2.1.9:
-  version "2.1.9"
-  resolved "https://registry.yarnpkg.com/project-name-generator/-/project-name-generator-2.1.9.tgz#959177f1feb2355d74fa98745d72a65a5f75b674"
-  integrity sha512-QmLHqz2C4VHmAyDEAFlVfnuWAHr4vwZhK2bbm4IrwuHNzNKOdG9b4U+NmQbsm1uOoV4kGWv7+FVLsu7Bb/ieYQ==
-  dependencies:
-    commander "^6.1.0"
-    lodash "^4.17.20"
-
 promise@^7.0.3, promise@^7.1.1:
   version "7.3.1"
   resolved "https://registry.yarnpkg.com/promise/-/promise-7.3.1.tgz#064b72602b18f90f29192b8b1bc418ffd1ebd3bf"