Add tslint rule "no-return-await": true

[azure]

Add tslint rule "no-return-await": true

[ramya-rao-a]

@bterlson I agree with this. Would you consider adding tslint.json to our template?

cc @jeremymeng

[bterlson]

I like the no-return-await rule, but it seems already enabled in the template?

[jeremymeng]

That's .eslintrc. We don't have tslint in template. I added eslint because tslint is going away in the future.

[bterlson]

Ahh sorry I misunderstood @ramya-rao-a's question. new projects shouldn't use tslint I think, so I'd prefer not to add it to the template.

[ramya-rao-a]

@bterlson Do we have any issue tracking the move to eslint?

[xirzec]

Closing this one, since we ended up needing the await for tracing spans anyway.