feat(cli-test): include expected test trace outputs for the "env" subcommands

[zimeg]

Summary

This PR adds the expected test trace outputs for the env command.

These are labelled as "variables" to match internal CLI structure - var is an alias of env - but that can be updated!

Requirements

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.66%. Comparing base (278514f) to head (dff7839). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2097 +/- ## ======================================= Coverage 91.65% 91.66% ======================================= Files 38 38 Lines 10311 10315 +4 Branches 647 647 ======================================= + Hits 9451 9455 +4 Misses 848 848 Partials 12 12 ``` | [Flag](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | Coverage Δ | | |---|---|---| | [cli-hooks](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | `95.23% <ø> (ø)` | | | [cli-test](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | `94.48% <100.00%> (+0.01%)` | :arrow_up: | | [oauth](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | `77.39% <ø> (ø)` | | | [socket-mode](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | `58.22% <ø> (ø)` | | | [web-api](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | `96.88% <ø> (ø)` | | | [webhook](https://app.codecov.io/gh/slackapi/node-slack-sdk/pull/2097/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi) | `96.65% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=slackapi#carryforward-flags-in-the-pull-request-comment) to find out more.

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[zimeg]

@filmaj @mwbrooks Thank y'all both for the reviews! This is set to land in the next CLI release, so I think it's alright to merge now and tag later.

I plan to follow up with this and perhaps a few other changes to @slack/cli-test in neartimes 👁️‍🗨️