Fix suite data parsing

[Yaswant Pradhan (yaswant)]

PR Summary

• Fix suite data parsing
• Avoid using legacy structures from the typing module (Optional and Union kept for Python 3.9 support)

Code Reviewer: James Bruten (@james-bruten-mo)

We have some formatting issues in generated trac.log - the groups are not parsed correctly. The issue is that the string contains spaces after the commas and potential single quotes inside the string, so simply stripping brackets/quotes from the entire string and then splitting by "," leaves raw quotes and spaces attached to the inner elements, e.g.,

['developer', 'ex1a_cce_um_safe_omp-seukv_noda_edgepert'] becomes
["developer'", " 'ex1a_cce_um_safe_omp-seukv_noda_edgepert"]

Here, I have introduced a fix using Python's built-in ast.literal_eval, which safely parses the string directly into a true Python list.

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[James Bruten (james-bruten-mo)]

Now that the cylc install we're using is using a more recent version of python this is fine to be upgraded