yjs server can't connect to the new kernel

[senwang86]

The yjs and api server still try to connect the previous kernel after activating a new kernel, to reproduce,

• create a new runtime
• delete the previous runtime
• check yjs container logging
• check api container logging

The problem got fixed after restart yjs and api containers twice.

[senwang86]

Need some help to understand the resolver_yjs.ts and yjs-runtime.ts.

[lihebi]

There are some leftover tasks in runtime. I'll work on that.

For now, if a runtime doesn't connect, just delete it and create a new one.