bin/rails subcommands other than "server" continue to involve the agent but shouldn't

[fallwith]

PR #2239 was expected make the agent compatible with Rails' standardization around a single rails CLI entrypoint and ensure that by default the agent would not be introduced into contexts where the majority of customers would not derive New Relic value from.

However, the submitter of Issue #1313 that was closed by the PR reports that the agent is still being introduced.

We should revisit our solution and determine what we can do to improve.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-262179