Allow VEnum types in the concat() function

[rjwills28]

I was asked by a user why the concat() function was returning an empty string when trying to concat 2 PVs. I realized that there PVs were VEnums, which aren't support by the concat() function. However, the labels are Strings and so it makes sense that we should be able to concat them.

I have made the changes to check if the type is VEnum and parse the value correctly.

I have also added a unit tests for the concat() function testing the VEnum and other types.

Checklist

• Testing:

  • The feature has automated tests
  • Tests were run
  • If not, explain how you tested your changes

• Documentation:

  • The feature is documented
  • The documentation is up to date
  • Release notes:
    • Added an entry if the change is breaking or significant
    • Added an entry when adding a new feature

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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