test(step-flow): refine testing suite

[divyajindel]

Proposed behaviour

Removes a number of Playwright tests that duplicate either Jest or Chromatic ones for the 'Step-flow' component

Current behaviour

There are a number of tests that exist in different forms in all the testing suites we do(Jest, Playwright, Chromatic) which cause a prolonged time of execution for no additional value.

Checklist

• Commits follow our style guide
• Related issues linked in commit messages if required
• Screenshots are included in the PR if useful
• All themes are supported if required
• Unit tests added or updated if required
• Playwright automation tests added or updated if required
• Storybook added or updated if required
• Translations added or updated (including creating or amending translation keys table in storybook) if required
• Typescript d.ts file added or updated if required
• Related docs have been updated if required

QA

• Tested in provided StackBlitz sandbox/Storybook
• Add new Playwright test coverage if required
• Carbon implementation matches Design System/designs
• UI Tests GitHub check reviewed if required

Additional context

This should decrease the time of execution without compromising testing and coverage

Testing instructions

Make sure the Playwright tests pass

[tomdavies73]

suggestion: you've got a test here still which is just checking if showProgressIndicator is true, but there's also a combo test below which also includes a show progress indicator in all of available steps, so this test can be deleted too.

[carbonci]

🎉 This PR is included in version 159.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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