Extend support of Scenario Outline variables to step text

[codecov[bot]]

Codecov Report

Base: 87.17% // Head: 87.21% // Increases project coverage by +0.04% :tada:

Coverage data is based on head (64f6e82) compared to base (127c478). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #447 +/- ## ========================================== + Coverage 87.17% 87.21% +0.04% ========================================== Files 39 39 Lines 2347 2355 +8 ========================================== + Hits 2046 2054 +8 Misses 301 301 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `87.21% <100.00%> (+0.04%)` | :arrow_up: | 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=radish-bdd#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/radish-bdd/radish/pull/447?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=radish-bdd) | Coverage Δ | | |---|---|---| | [radish/scenariooutline.py](https://codecov.io/gh/radish-bdd/radish/pull/447?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=radish-bdd#diff-cmFkaXNoL3NjZW5hcmlvb3V0bGluZS5weQ==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=radish-bdd). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=radish-bdd)

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