Don't error out if cleanup fails

[celinval]

Description of changes:

Benchcomp CI is now broken due to #2704. The clean up we are performing is a best effort at this point, but it shouldn't fail the regression if it doesn't work.

Resolved issues:

Resolves #ISSUE-NUMBER

Related RFC:

Optional #ISSUE-NUMBER.

Call-outs:

Testing:

• How is this change tested?

• Is this a refactor change?

Checklist

• Each commit message has a non-empty body, explaining why the change was made
• Methods or procedures are documented
• Regression or unit tests are included, or existing tests cover the modified code
• My PR is restricted to a single feature or bugfix

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

[celinval]

Running benchmark CI since that's the one we are trying to fix

[tautschnig]

Just to clarify: this failed the benchcomp task, because said task invokes setup twice, and it's the setup step that performs the cleanup.