Remove superfluous lib: true, type: redis, service: true, models: true, services: true, no_db: true, api: true
Signed-off-by: NRémy Coutable <remy@rymai.me>

When sending the usage data, it now includes all pipelines. This commit
will split the pipelines in two; internal and external.

This will lead to historical data being incorrectly marked this way.

Fixes gitlab-org/gitlab-ce#33172

So that we could use it for the schedule before
trying to use CreatePipelineService

* implemented logging of project and system web hooks
* implemented UI for user area (project hooks)
* implemented UI for admin area (system hooks)
* implemented retry of logged webhook
* NOT imeplemented log remover

Make it gracefully handle unexisting pipelines and refactor iterating
all the merge request paths.

And add some specs.

Turn ExpirePipelineCacheService into Worker so it can fetch all the
merge requests for which the pipeline runs or did run against.

Enable caching in the Etag::Middleware and when a pipeline changes
status, expire the cache for the project pipelines path.