chore(eventsource): update eventsource to v3 #6396

Job	Run time
Installing & Building	2m 20s
Build API Reference	55s
Lint commit messages	16s
Linting & Testing (agent)	1m 5s
Linting & Testing (forest-cloud)	56s
Linting & Testing (datasource-customizer)	56s
Linting & Testing (datasource-dummy)	31s
Linting & Testing (datasource-mongoose)	1m 12s
Linting & Testing (datasource-replica)	44s
Linting & Testing (datasource-mongo)	1m 2s
Linting & Testing (datasource-sequelize)	1m 8s
Linting & Testing (datasource-sql)	1m 3s
Linting & Testing (datasource-toolkit)	43s
Linting & Testing (forestadmin-client)	55s
Linting & Testing (plugin-aws-s3)	37s
Linting & Testing (plugin-export-advanced)	28s
Linting & Testing (plugin-flattener)	32s
Send Coverage	0s
Publish API Reference	0s
Release packages	0s
	15m 23s

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