Fixed handling of multiselect values in classificationstore

[turbo-ele]

Multiselect values are being returned as arrays, therefore the cast to string fails and throws an exception.

Background:
Until now, each value of a classificationstore keyconfig is being stored as array of strings (with just one possible value in the array). E.g.

    "classificationStoreName": {
      "values": {
        "1": [
          "test_value"
        ],
        "4": [
          "another_test_value"
        ],

With this change, the index will now have multiple values, when multiple select elements were selected.

    "classificationStoreName": {
      "values": {
        "1": [
          "test_value"
        ],
        "4": [
          "another_test_value",
          "yet_another_test_value"
        ],

[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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