Protected packages: Return ServiceResponse for CreateConanPackageService

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What does this MR do and why?

• Returning a successful ServiceResponse as suggested in the GitLab best practice guidelines. see https://docs.gitlab.com/ee/development/reusing_abstractions.html#serviceresponse
• Exceptions raised in Packages::Conan::CreatePackageService have been transformed to erroneous service response
• This MR follows the same approach as in other MR, e.g. Protected packages: Return ServiceResponse for ... (!140778 - merged) and Protected packages: Return ServiceResponse in P... (!141386 - merged)

🛠 with ❤ at Siemens

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

MR Checklist (@gerardo-navarro)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides

Screenshots or screen recordings

Only backend changes. No frontend changes.

How to set up and validate locally

1. Run the tests related to conan package creation to ensure that everything works fine

bundle exec rspec spec/services/packages/conan/create_package_service_spec.rb spec/requests/api/conan/v1/instance_packages_spec.rb spec/requests/api/conan/v1/project_packages_spec.rb

Related to #323975 (closed)