hotfix: stepper

[shenyih0ng]

Description

This is a hotfix for the stepper after #2304.

The issue lies in how the stepper and REPL output uses the same workspace output state (WorkspaceState["output"]). Therefore, we cannot stringify all outputs as the stepper UI relies on a array of steps.

There will be a future PR (#2306) to address this issue properly with a separation of state between the output of REPL, stepper and other debuggers

[coveralls]

Pull Request Test Coverage Report for Build 3882390779

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 34.443%

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Totals
Change from base Build 3870218754:	0.006%
Covered Lines:	4582
Relevant Lines:	12377

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💛 - Coveralls