fix(spotlight): Use the spotlight_url passed into the SDK when loading Spotlight

[BYK]

When we inject spotlight, we don't set the correct sidecar URL. This is an issue when a user defines a custom sidecar URL where we are able to load Spotlight UI from the correct URL but don't tell it the correct sidecar URL, making it non-functional.

[sentrivana]

lgtm, just the formatting needs fixing since it's throwing a syntax error

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
13825	2	13823	4130

View the top 2 failed tests by shortest run time

tests.integrations.stdlib.test_httplib test_http_timeout

Stack Traces | 20.2s run time

.../integrations/stdlib/test_httplib.py:373: in test_http_timeout
    assert len(transaction["spans"]) == 1
E   assert 0 == 1
E    +  where 0 = len([])

tests.integrations.stdlib.test_httplib test_http_timeout

Stack Traces | 20.2s run time

.../integrations/stdlib/test_httplib.py:373: in test_http_timeout
    assert len(transaction["spans"]) == 1
E   assert 0 == 1
E    +  where 0 = len([])

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