[ESM] Remove warning when worker shutdown is graceful

[gregfurman]

Motivation

Removes an unnecessary log on shutdown with event source mappings.

Changes

• Adds a flag to check if shutdown was graceful before logging an invalid state error.

[github-actions]

LocalStack Community integration with Pro

    2 files  ±  0      2 suites  ±0   1h 32m 13s ⏱️ - 19m 47s
3 110 tests  - 994  2 890 ✅  - 882  220 💤  - 112  0 ❌ ±0 
3 112 runs   - 994  2 890 ✅  - 882  222 💤  - 112  0 ❌ ±0 

Results for commit 43b8f2c. ± Comparison against base commit e509f9d.

This pull request removes 994 tests.

tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

[dfangl]

It's hacky, but seems to be the best solution for now.