[kotlin-spring] Fix cookie parameter code generation in API

[oscarr-reyes]

Fixes #7406

When generating API interfaces or class controllers from a 3.0 spec file that contains cookie parameter in the request, the output code doesn't contain the endpoint parameter for resolving the cookie value that is in the spec, the template files don't contain the section for cookie and since it's part of allParams section an empty space is generated with a comma, making the generated code to be erroneous.

This PR adds the required template code for generating cookie parameter values from the spec file.

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[oscarr-reyes]

@jimschubert @dr4ke616 @karismann @Zomzog @andrewemery @4brunu @yutaka0m @stefankoppier

[wing328]

lgtm. thanks for the PR

[wing328]

FYI. samples updated via 8dae702