Add rebuild cache functionality to issue and patch listing

In case of an outdated cobs cache we display a banner on top of the
patch or issue listing, to allow users to rebuild the cobs cache of a
repo similar to running `rad patch cache`
After rebuilding we fetch the issues or patches from the start.

Small caveat with patches:
The banner can only be shown after a user fetched all patches from the
backend, so we are sure we tried to fetch all of them.

Cargo.lock

@@ -4115,6 +4115,7 @@ dependencies = [
  "serde_json",
  "sqlite",
  "ssh-key",
+ "tauri",
  "tauri-plugin-clipboard-manager",
  "tauri-plugin-fs",
  "tempfile",