Move conan v1 search endpoint to conan shared endpoint

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What does this MR do and why?

This move the conan v1 search endpoint to shared endpoints, so this endpoint can be use for conan v2. The search endpoint is only a search on package recipes, so it is not affected by revision and can be reuse for v2.

Changelog: changed

MR acceptance checklist

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How to set up and validate locally

Supposing you have a conan remote called "gitlab-local" pointing to your local gitlab project. If not, you can set it up following the documentations: https://docs.gitlab.com/ee/user/packages/conan_repository/#add-a-remote-for-your-project

1. Create a new conan package

mkdir searchTestpkg && cd searchTestpkg
conan new searchTest/1.2.3@gitlab-org+conan/stable --template=cmake_lib
conan create . gitlab-org+conan/stable

2. Upload the package

conan upload searchTest/1.2.3@gitlab-org+conan/stable -r gitlab-local --all

3. Search for the package

conan search searchTest/*@gitlab-org+conan/stable -r gitlab-local

Conan should return:

Existing package recipes:

searchTest/1.2.3@gitlab-org+conan/stable

4. Search for the package with feature flag on

For GDK, open rails console (docs):

gdk rails console

Enable the feature flag:

# Enable
Feature.enable(:conan_package_revisions_support)

# Verify
Feature.enabled?(:conan_package_revisions_support)

Turn on revision on conan

export CONAN_REVISIONS_ENABLED=1

Search for the package:

conan search searchTest/*@gitlab-org+conan/stable -r gitlab-local

Conan should return:

Existing package recipes:

searchTest/1.2.3@gitlab-org+conan/stable

Related to #333033 (closed)

/cc @mbo5be