Add new option Strings+JSON for result grid copy quote

[adityatoshniwal]

Describe the solution you'd like As per the discussion here - https://github.com/pgadmin-org/pgadmin4/issues/8157#issuecomment-2526910087, we can introduce a new option Strings + JSON along with None, All, Strings. As part of Strings, JSON will not be quoted. JSON will be quoted when Strings + JSON is selected and it will be the default selected value. Currently, JSON is considered as String and quoted which few users do not want. With the new option, user will have the flexibility for JSON field.