refactor(client): allow to close gracefully the current event source #4278

Job	Run time
Installing & Building	2m 59s
Linting & Testing (agent)	2m 3s
Linting & Testing (datasource-customizer)	1m 13s
Linting & Testing (datasource-dummy)	35s
Linting & Testing (datasource-mongoose)	1m 44s
Linting & Testing (datasource-sequelize)	41s
Linting & Testing (datasource-sql)	3m 15s
Linting & Testing (datasource-toolkit)	1m 7s
Linting & Testing (forestadmin-client)	1m 5s
Linting & Testing (plugin-aws-s3)	38s
Linting & Testing (plugin-export-advanced)	31s
Linting & Testing (plugin-flattener)	41s
Lint commit messages	13s
Build API Reference	1m 28s
Send Coverage	12s
Release packages	0s
Publish API Reference	0s
	18m 25s

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