[sidekiq] add basic Vernier spec

[solnic]

WIP

Fixes #2457

[github-actions[bot]]

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:no_entry_sign:	Please consider adding a changelog entry for the next release.

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## Unreleased

- [sidekiq] add basic Vernier spec ([#2465](https://github.com/getsentry/sentry-ruby/pull/2465))

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[codecov[bot]]

Codecov Report

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

Project coverage is 98.13%. Comparing base (b31f0f3) to head (cea776f). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2465 +/- ## ======================================= Coverage 98.13% 98.13% ======================================= Files 126 126 Lines 4767 4767 ======================================= Hits 4678 4678 Misses 89 89 ``` | [Components](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | Coverage Δ | | |---|---|---| | [sentry-ruby](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `98.51% <ø> (ø)` | | | [sentry-rails](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `97.08% <ø> (ø)` | | | [sentry-sidekiq](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `96.96% <ø> (ø)` | | | [sentry-resque](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `92.85% <ø> (ø)` | | | [sentry-delayed_job](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `95.65% <ø> (ø)` | | | [sentry-opentelemetry](https://app.codecov.io/gh/getsentry/sentry-ruby/pull/2465/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getsentry) | `99.31% <ø> (ø)` | |

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