toggle to silence multienv output

[3bbbeau]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story
As an end-user of Atlantis, when multienv is used, I don't want to see this output.

Describe the solution you'd like
Environment variable to disable multienv output, e.g. ATLANTIS_MULTIENV_OUTPUT.

This would suppress the following output when Atlantis runs a plan/apply:

Dynamic environment variables added:
FOO_BAR_ENV
FOO_BAZ_ENV
...
...

multienv is powerful for configuration within workflows, but when used has the disadvantage of reducing visibility that Atlantis provides by outputting redundant information.

Describe the drawbacks of your solution
I can't think of any drawbacks, as this would be opt-in and someone using it should be aware of the loss of contextual information from multienv.

Describe alternatives you've considered

• Using a standard env instead with output disabled, however that defeats the flexibility of the multienv directive.
• Implementing a toggle like output: hide, which is used in run directives, instead of an environment variable toggle.

[3bbbeau]

(Thank you @anryko for working on this issue! I appreciate it!)