Adds `# frozen_string_literal: true` to spec/models ruby files

Port of a community contribution from @glensc to upstream.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/47677 for more information

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

Due to the change in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14583/diffs we
can't use the same method to access assets in a CI and the local test
environment anymore.

the ci status icons are generated client side, wo we don't need the
static files anymore.

Leaving a trailing slash in the context option causes the jira-ruby
gem to add an extra slash in HTTP requests to the URL, preventing
JIRA from working properly.

Closes #42494

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

Remove superfluous lib: true, type: redis, service: true, models: true, services: true, no_db: true, api: true

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

The implicit interface of project services states that the "execute"
method is meant to be called when project hooks are executed.
Currently JiraService does not support any project events even though
JiraService#supported_events says that "commit" and "merge_request"
are supported. They are only used to render correct options in
JIRA configuration screen, but they are not supported.
Because of that, this commit makes "execute" method a no-op.