Dont use threading.Timer when finishing long running Transactions

[antonpirker]

After thinking about high volume servers, creating a thread on each request is probably a lot of overhead.

So this is now a version, to check the duration of the transaction when a span is closed.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
15499	1	15498	4436

View the top 1 failed tests by shortest run time

tests.integrations.wsgi.test_wsgi test_long_running_transaction_finished

Stack Traces | 1.67s run time

.../integrations/wsgi/test_wsgi.py:541: in test_long_running_transaction_finished
    assert (
E   AssertionError: Long running transaction has not been finished after a set maximum duration
E   assert 1.050503 <= (1 * 1.05)

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[sl0thentr0py]

@antonpirker this needs to rebased after the revert