Add option to enable connecting to multiple authenticated proxies during tests

[mdmintz]

Add option to enable connecting to multiple authenticated proxies during tests

Currently, proxy.zip and proxy_ext_dir are hardcoded so that tests can connect to a proxy and reuse the same config, but that can be limiting if people want to connect to multiple proxies for multi-threaded tests. I'm planning on adding the following options to allow for flexible naming based on number increments:

• --multi-proxy (Command-line option for pytest)
• multi_proxy=True (SB manager, Driver manager, browser_launcher direct calls)

This would result in creating proxy_1.zip, proxy_2.zip, etc. and proxy_ext_dir_1, proxy_ext_dir_2, etc. for each test so that different authenticated proxies can be used.

Eg. (Via parameterized tests):

from parameterized import parameterized
from seleniumbase import BaseCase
BaseCase.main(__name__, __file__)

class SearchTests(BaseCase):
    @parameterized.expand(
        [
            ["user1:pass1@server1:port1"],
            ["user2:pass2@server2:port2"],
            ["user3:pass3@server3:port3"],
        ]
    )
    def test_parameterized_proxy(self, proxy_string):
        self.get_new_driver(proxy=proxy_string)
        # ...

And run that with: pytest -n=3 --multi-proxy

Enabling this via an option (rather than having this always enabled) is important so that the downloaded_files folder (where proxy config files are stored) isn't getting polluted with multiple identical files when the same proxy configuration is being used for all tests on purpose.

[mdmintz]

This was resolved in 4.13.23 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.13.23