crash reporter: only show reporter once per exception groupid

- don't show crash reporter multiple times for the "same" exception
  - at least until the user restart the program (there is no persistence)
- this is a ~replacement for the removed "Never show crash reporter" option
- in case there e.g. a thread with timer spamming an exception erroneously,
  this ensures we only offer to send the crash report once (per process lifecycle)

electrum/base_crash_reporter.py

@@ -33,6 +33,7 @@ from . import constants
 from .i18n import _
 from .util import make_aiohttp_session, error_text_str_to_safe_str
 from .logging import describe_os_version, Logger, get_git_version
+from .crypto import sha256
 
 if TYPE_CHECKING:
     from .network import ProxySettings
@@ -140,6 +141,17 @@ class BaseCrashReporter(Logger):
             "id": _id,
         }
 
+    @classmethod
+    def get_traceback_groupid_hash(
+        cls,
+        exctype: type[BaseException],
+        excvalue: BaseException,
+        tb: TracebackType | None,
+    ) -> bytes:
+        tb_info = cls.get_traceback_info(exctype, excvalue, tb)
+        _id = tb_info["id"]
+        return sha256(str(_id))
+
     def get_additional_info(self):
         args = {
             "app_version": get_git_version() or ELECTRUM_VERSION,