Remove all but 2 eslint-disable pragmas (#1335)

Turns off:
 - no-explicit-any (we need to handle any return values from runPython)
 - no-unsafe-assignment (noisy and pointless)

And resolves all but two remaining ones. The last two lints regard access to private Pyodide variables and so:
 - they are not easy to work around without an upstream Pyodide patch
 - they should trigger linter and require explicit override

pyscriptjs/src/components/pywidget.ts

@@ -40,8 +40,7 @@ function createWidget(interpreter: InterpreterClient, name: string, code: string
             await interpreter.globals.set(this.id, this.proxy);
         }
     }
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    const xPyWidget = customElements.define(name, CustomWidget);
+    customElements.define(name, CustomWidget);
 }
 
 export function make_PyWidget(interpreter: InterpreterClient) {