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

[antonpirker]

As we are moving to Potel, we will not merge this, because the performance part of the SDK will be done by OpenTelementry instrumentations in the future. So this is not needed anymore.