[Teams-admin] Fixes/Changes for Management apps

[ArtieReus]

• [teams]:
• [x] There are no errors shown to the user if no login succeed or login not done. Just a black window. Check if loggedIn and if not, then display a message to the user. See Supernova or doop as example.
• [x] display errors from api client. If API client has errors show the error code and error message to the user in a Message component
• [x] embedded prop is not implemented correctly. The embedded prop can be string or boolean (depending on where it comes from. So the current check: {props.embedded === false} doesn't work as expected because String false is not strictly equal to boolean false, "false" !== false. See juno template app for example how to fix the expression
• [x] Store state (e.g. which team was selected) in URL and also read from URL when loading. See Supernova/Doop useUrlState hook.
• [x] Remove teams side navigation, instead add a filter section (similar to supernova) where teams can be selected from a Select box
• [ ] Implement a mock if you want to visualize anything. If not, we'll need to use a real login in the management app, being careful not to commit it accidentally
• [x] add endless scroll feature to team member list (automatic loading of more entries when user scrolls down). See Supernova alerts list for how this is done

[edda]

Done. See here: https://github.wdf.sap.corp/cc/greenhouse/issues/54

[ArtieReus]

https://github.wdf.sap.corp/cc/greenhouse/tree/main/ui/team-admin