Feat/adapt connectors to poll

[cardosofede]

Before submitting this PR, please make sure:

• [ ] Your code builds clean without any errors or warnings
• [ ] You are using approved title ("feat/", "fix/", "docs/", "refactor/")

A description of the changes proposed in the pull request: Remove connectors based on the latest poll

Tests performed by the developer:

Tips for QA testing:

[nikspz]

• Reviewed vega_perpetual removed from available connectors
• review vega_perpetual tests removed

[nikspz]

old PR also contains this dependency

[nikspz]

commit d5098e0

• Review okx_perpetual test added to ignore in Makefile

• Review vega_perpetual + tests removed

• Review Polkadex removed (result of not voted in https://snapshot.box/#/s:hbot.eth)

• Got an issue for vertex exchange on make test 3/3, also on clean install / reinstall

test-20feb2.txt

___________________________________________ TestVertexExchange.test_update_time_synchronizer_failure_is_logged ____________________________________________

self = <test.hummingbot.connector.exchange.vertex.test_vertex_exchange.TestVertexExchange testMethod=test_update_time_synchronizer_failure_is_logged>
mock_api = <aioresponses.core.aioresponses object at 0x783efc56f5e0>

    @aioresponses()
    def test_update_time_synchronizer_failure_is_logged(self, mock_api):
        self.exchange._set_current_timestamp(1640780000)
        url = self.get_query_url(CONSTANTS.QUERY_PATH_URL, CONSTANTS.STATUS_REQUEST_TYPE)

        response = {"status": "success", "data": "failed"}

        mock_api.get(url, body=json.dumps(response), status=400)

        self.async_run_with_timeout(self.exchange._update_time_synchronizer())
>       self.assertGreater(1640780000 * 1e-3, self.exchange._time_synchronizer.time())
E       AssertionError: 1640780.0 not greater than 2216015.6838050615

test/hummingbot/connector/exchange/vertex/test_vertex_exchange.py:1121: AssertionError