[HOTFIX] Fix processing of jsonpath for SLIS select criteria

[emmakarova]

Description
Currently when building the select criteria parameter for the SLIS requests in system fetcher jsonpath is separated by comma only. With this PR a regex is used for separation.

Changes proposed in this pull request:

• use regex to match the top parent of json path of a placeholder

Related issue(s)

• ...

Pull Request status

• Implementation
• Unit tests
• Integration tests
• chart/compass/values.yaml is updated
• Mocks are regenerated, using the automated script

[kyma-bot]

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