Adds explicit require for influxdb-client

What does this MR do and why?

I missed another library that needs to be explicitly required for the formatter to work 😓

influxdb-client needs to be imported explicitly so that it can be used properly.

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How to set up and validate locally

Verified it by using this gem version in my cdot branch to make sure I am not getting an uninitialized constant error.

• With the fix: https://gitlab.com/gitlab-org/customers-gitlab-com/-/jobs/6917968353#L256
• Without the fix: https://gitlab.com/gitlab-org/customers-gitlab-com/-/jobs/6916895840#L258

The one with the fix still failed but that's more just because the influxdb_token was not set in my test branch 😅

MR acceptance checklist

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