Exclude tool call errors from last_message and all_messages subagent … #6408

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 11s
test-integration-packages/billing	1m 7s
test-integration-common	47s
test-integration-packages/agent-runtime	39s
test-integration-sdk	1m 19s
test-.agents	47s
test-integration-web	50s
test-integration-cli	44s
test-packages/billing	53s
test-common	44s
test-packages/agent-runtime	50s
test-packages/internal	57s
test-sdk	45s
test-web	1m 5s
test-cli	1m 1s
	16m 46s

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