[Test] Add baseUrl environment tests to all service test files

[gcatanese]

Context

RecurringTest.py has three tests that validate the baseUrl resolves correctly for both environments:

def test_base_url_test_environment(self):
    url = self.adyen.client._determine_api_url("test", self.baseUrl)
    self.assertEqual(url, self.baseUrl)
    self.assertTrue(url.startswith("https://pal-test.adyen.com/pal/servlet/Recurring/"))

def test_base_url_live_environment(self):
    self.adyen.client.live_endpoint_prefix = "1797a841fbb37ca7-AdyenDemo"
    recurring_version = self.baseUrl.split("/")[-1]
    url = self.adyen.client._determine_api_url("live", self.baseUrl)
    self.assertEqual(
        url,
        f"https://1797a841fbb37ca7-AdyenDemo-pal-live.adyenpayments.com"
        f"/pal/servlet/Recurring/{recurring_version}",
    )
    self.adyen.client.live_endpoint_prefix = None

def test_base_url_live_environment_no_prefix_raises(self):
    self.adyen.client.live_endpoint_prefix = None
    self.assertRaises(
        AdyenEndpointInvalidFormat,
        self.adyen.client._determine_api_url,
        "live",
        self.baseUrl,
    )

These tests are missing from all other service test files:

• BalancePlatformTest.py
• BinLookupTest.py
• CapitalTest.py
• CheckoutTest.py
• DataProtectionTest.py
• DisputesTest.py
• LegalEntityManagementTest.py
• ManagementTest.py
• ModificationTest.py (payments)
• PaymentTest.py
• PosMobileTest.py
• SessionAuthenticationTest.py
• StoredValueTest.py
• ThirdPartyPayoutTest.py
• TransfersTest.py

Proposed Change

Add the equivalent of test_base_url_test_environment, test_base_url_live_environment, and test_base_url_live_environment_no_prefix_raises to each service test file, adapting the expected URLs to match the service's URL pattern (PAL, checkout, balancePlatform, management, etc.).

Note: test_base_url_live_environment_no_prefix_raises only applies to services that require a live_endpoint_prefix (i.e. PAL and checkout-based services).

Benefit

Ensures that URL resolution for both test and live environments is explicitly verified for every service, catching regressions in _determine_api_url early.