[System] `process.env.whitelist` in agent template is malformed

I believe there is an issue with the agent handlebars template for the `process.env.whitelist` field, there isn't a key before printing the items:

https://github.com/elastic/integrations/blob/aed6e1c2f92ec6fe05f9322891706a71683ab103/packages/system/data_stream/process/agent/stream/stream.yml.hbs#L7-L12

This is causing the agent yaml that Fleet generates to be malformed:

![image](https://user-images.githubusercontent.com/1965714/174128859-c9f92e4c-8a69-4b3f-a16f-c3e2ff20e337.png)


	process.include_cpu_ticks: {{process.include_cpu_ticks}}
	{{#if process.env.whitelist}}
	{{#each process.env.whitelist}}
	- {{this}}
	{{/each}}
	{{/if}}

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[System] `process.env.whitelist` in agent template is malformed #3519

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[System] process.env.whitelist in agent template is malformed #3519

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[System] `process.env.whitelist` in agent template is malformed #3519