Update pytest-xdist Usage

[Bibo-Joshi]

Trying to get things for #4271 done in smaller chunks
Also addresses one point from #4324

[harshil21]

This simple configuration change seems to reduce CI test time by about 1 min on average.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
5984	1	5983	278

View the top 1 failed tests by shortest run time

tests.ext.test_basepersistence.TestBasePersistence test_update_persistence_loop_saved_data_job[all_data]

Stack Traces | 2.57s run time

self = <tests.ext.test_basepersistence.TestBasePersistence object at 0x000001EB8B12E350>
papp = PytestApplication[bot=PytestExtBot[token=690091347:AAFLmR5pAB5Ycpe_mOh7zM4JFBOh0z3T0To]]
chat_id = '675666224'

    @papp_store_all_or_none
    async def test_update_persistence_loop_saved_data_job(self, papp: Application, chat_id):
        papp.add_handler(
            MessageHandler(filters.ALL, callback=self.handler_callback(chat_id=chat_id)), group=-1
        )
    
        async with papp:
            await papp.job_queue.start()
            papp.job_queue.run_once(
                self.job_callback(chat_id=chat_id), when=1.5, chat_id=1, user_id=1
            )
            await asyncio.sleep(2.5)
    
            assert not papp.persistence.bot_data
            assert papp.persistence.bot_data is not papp.bot_data
            assert not papp.persistence.chat_data
            assert papp.persistence.chat_data is not papp.chat_data
            assert not papp.persistence.user_data
            assert papp.persistence.user_data is not papp.user_data
            assert papp.persistence.callback_data == ([], {})
            assert (
                papp.persistence.callback_data is not papp.bot.callback_data_cache.persistence_data
            )
            assert not papp.persistence.conversations
    
            await papp.update_persistence()
    
            assert papp.persistence.bot_data is not papp.bot_data
            if papp.persistence.store_data.bot_data:
                assert papp.persistence.bot_data == {"key": "value", "refreshed": True}
            else:
                assert not papp.persistence.bot_data
    
            assert papp.persistence.chat_data is not papp.chat_data
            if papp.persistence.store_data.chat_data:
>               assert papp.persistence.chat_data == {1: {"key": "value", "refreshed": True}}
E               AssertionError: assert defaultdict(<...s 'dict'>, {}) == {1: {'key': '...eshed': True}}
E                 
E                 Right contains 1 more item:
E                 {1: {'key': 'value', 'refreshed': True}}
E                 
E                 Full diff:
E                 + defaultdict(<class 'dict'>, {})
E                 - {
E                 -     1: {
E                 -         'key': 'value',
E                 -         'refreshed': True,
E                 -     },
E                 - }

tests\ext\test_basepersistence.py:901: AssertionError

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