fix: json parsing issues with string arrays in dpp::application

[Commandserver]

The previously used method basic_json::to_string adds quotation marks around the string when parsing. Replaced basic_json::to_string with basic_json::get<std::string>.

I noticed this issue in dpp::application and also adjusted it in dpp::emoji and dpp::integration.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[Jaskowicz1]

Feel like we should have CI check this stuff if there's been issues with it, just so we can catch it.

[braindigitalis]

Feel like we should have CI check this stuff if there's been issues with it, just so we can catch it.

lets just add unit tests for it

[Jaskowicz1]

Feel like we should have CI check this stuff if there's been issues with it, just so we can catch it.

lets just add unit tests for it

yeah that's what I mean lol