Add history chat deletion #6493

Job	Run time
build-and-check	3m 1s
test-integration-packages/internal	1m 5s
test-integration-packages/billing	1m 2s
test-integration-web	46s
test-packages/agent-runtime	42s
test-integration-cli	50s
test-packages/internal	51s
test-integration-common	45s
test-cli	55s
test-packages/billing	39s
test-common	39s
test-web	1m 7s
test-integration-packages/agent-runtime	43s
test-.agents	42s
test-sdk	54s
test-integration-sdk	1m 13s
	15m 54s

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