Which could extend from EE

* Replace `require` or `require_relative` with `require_dependency`
* Remove unneeded `autoload`

This gem (https://gitlab.com/gitlab-org/grape-path-helpers) makes a number of changes:

1. Brings in @mdelaossa's changes in https://github.com/reprah/grape-route-helpers/pull/21
2. Fixes some broken specs and code for Grape 1.0+
3. Optimizes the generation of paths by bringing in @dblessing's
   HashWithIndifferentAccess changes in https://gitlab.com/gitlab-org/gitlab-ce/issues/45718#note_70123793

Closes #45718

This endpoint lists projects shared with a group visible to the
current user.

The `filter` and `sort` params are supported like on the `children` endpoint.

We request Gitaly in a N+1 manner to build discussion diffs. Once the diffs are from different revisions, it's hard to make a single request to the service in order to build the whole response.
With this change we solve this problem and simplify a lot fetching this piece of info.

This sampler can interfere with tests and cause transient build failures,
such as https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/70241683.

Signed-off-by: NRémy Coutable <remy@rymai.me>

Signed-off-by: NRémy Coutable <remy@rymai.me>

Monkey patches Kubeclient::Client#proxy_url in order to make it compliant with version 1.10 of kubernetes API

Also, don't use the provided Middleware, which isn't thread-safe, and
instantiate a new Flipper instance per thread instead.
Signed-off-by: NRémy Coutable <remy@rymai.me>

Current logging tells us we've isolated the calls to about 5 call sites,
now we'd like to know what is calling these methods.

Given the settings initializer creates Gitaly Storage Settings objects
already, the calls to path can be moved to that initializer.

Fixes #43715