Coerce None values into strings in logentry params.

[antonpirker]

Nice rendering of log messages containing parameters that are None values does not work. There we coerce None values into strings to have nicer messages in Sentry UI.

Fixes #3660

[codecov]

❌ 13 Tests Failed:

Tests completed	Failed	Passed	Skipped
23698	13	23685	5840

View the top 3 failed test(s) by shortest run time

tests.integrations.logging.test_logging test_custom_log_level_names

Stack Traces | 0.006s run time

.../integrations/logging/test_logging.py:155: in test_custom_log_level_names
    assert events[0]["logentry"]["params"] == [logging_level]
E   AssertionError: assert ['10'] == [10]
E     
E     At index 0 diff: '10' != 10
E     
E     Full diff:
E       [
E     -     10,
E     +     '10',
E     ?     +  +
E       ]

tests.integrations.logging.test_logging test_custom_log_level_names

Stack Traces | 0.006s run time

.../integrations/logging/test_logging.py:155: in test_custom_log_level_names
    assert events[0]["logentry"]["params"] == [logging_level]
E   AssertionError: assert ['10'] == [10]
E     
E     At index 0 diff: '10' != 10
E     
E     Full diff:
E       [
E     -     10,
E     +     '10',
E     ?     +  +
E       ]

tests.integrations.logging.test_logging test_custom_log_level_names

Stack Traces | 0.006s run time

.../integrations/logging/test_logging.py:155: in test_custom_log_level_names
    assert events[0]["logentry"]["params"] == [logging_level]
E   AssertionError: assert ['10'] == [10]
E     
E     At index 0 diff: '10' != 10
E     
E     Full diff:
E       [
E     -     10,
E     +     '10',
E     ?     +  +
E       ]

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