Revert "Commit after changing job state"

This reverts commit 061d4c3.

Fixes:

```
Traceback (most recent call last):
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/jobs/handler.py", line 1083, in __monitor
    self.__monitor_step()
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/jobs/handler.py", line 1115, in __monitor_step
    self._check_jobs(session, jobs_to_check)
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/jobs/handler.py", line 1181, in _check_jobs
    self.__stop(job, session)
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/jobs/handler.py", line 1099, in __stop
    job.set_state(job.states.STOPPED)
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/model/__init__.py", line 1703, in set_state
    self.state_history.append(JobStateHistory(self))
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py", line 487, in __get__
    return self.impl.get(state, dict_)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py", line 959, in get
    value = self._fire_loader_callables(state, key, passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py", line 995, in _fire_loader_callables
    return self.callable_(state, passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/strategies.py", line 912, in _load_for_state
    return self._emit_lazyload(
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/strategies.py", line 1022, in _emit_lazyload
    lazy_clause, params = self._generate_lazy_clause(state, passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/strategies.py", line 807, in _generate_lazy_clause
    value = mapper._get_state_attr_by_column(
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/mapper.py", line 3018, in _get_state_attr_by_column
    return state.manager[prop.key].impl.get(state, dict_, passive=passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py", line 959, in get
    value = self._fire_loader_callables(state, key, passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/attributes.py", line 990, in _fire_loader_callables
    return state._load_expired(state, passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/state.py", line 712, in _load_expired
    self.manager.expired_attribute_loader(self, toload, passive)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/loading.py", line 1451, in load_scalar_attributes
    result = load_on_ident(
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/loading.py", line 407, in load_on_ident
    return load_on_pk_identity(
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/loading.py", line 530, in load_on_pk_identity
    session.execute(
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 1716, in execute
    conn = self._connection_for_bind(bind)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 1552, in _connection_for_bind
    TransactionalContext._trans_ctx_check(self)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.8/site-packages/sqlalchemy/engine/util.py", line 199, in _trans_ctx_check
    raise exc.InvalidRequestError(
sqlalchemy.exc.InvalidRequestError: Can't operate on closed transaction inside context manager.  Please complete the context manager before emitting further commands.
```

at the cost of larger transactions that are more likely to deadlock.
Still likely a better tradeoff. Probably fixes
test/integration/test_interactivetools_api.py::TestInteractiveToolsIntegration::test_multi_server_realtime_tool.

lib/galaxy/model/__init__.py

@@ -1697,9 +1697,9 @@ def set_state(self, state: JobState) -> bool:
                 .where(Job.id == self.id, ~Job.state.in_((state, *Job.finished_states)))
                 .values(state=state)
             )
-            with transaction(session):
-                session.commit()
             if rval.rowcount == 1:
+                # Need to expire state since we just updated it, but ORM doesn't know about it.
+                session.expire(self, ["state"])
                 self.state_history.append(JobStateHistory(self))
                 return True
             else: