test(sessions): Add comments to explain test

[szokeasaurusrex]

Implement suggestion from #3419 (comment).

#skip-changelog

[codecov]

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
11522	4	11518	1635

View the top 3 failed tests by shortest run time

tests.integrations.aws_lambda.test_aws test_init_error[python3.11]

Stack Traces | 11.6s run time

.../integrations/aws_lambda/test_aws.py:334: in test_init_error
    (event,) = envelope_items
E   ValueError: not enough values to unpack (expected 1, got 0)

tests.integrations.aws_lambda.test_aws test_init_error[python3.9]

Stack Traces | 11.7s run time

.../integrations/aws_lambda/test_aws.py:334: in test_init_error
    (event,) = envelope_items
E   ValueError: not enough values to unpack (expected 1, got 0)

tests.integrations.aws_lambda.test_aws test_init_error[python3.10]

Stack Traces | 12s run time

.../integrations/aws_lambda/test_aws.py:334: in test_init_error
    (event,) = envelope_items
E   ValueError: not enough values to unpack (expected 1, got 0)

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[antonpirker]

thanks!