Change runner type "specific" to "project"
## Release notes
{placeholder for release notes}
# Problem to solve
Runners have 3 types, shared, group, and specific. They are based on where runners were registered (in the admin area (shared), in a group (group), and in a project (specific). We inconsistently use `shared` and `instance` to refer to runners that were registered in the admin area. We have heard multiple internal GitLab members ask for this change to be made, and have seen confusion with GitLab users when I used `shared runners` in usability studies.
## Proposal
Rename `specific` to `project`.
### Vision

### List of related files
`@mrincon` made a first attempt at finding occurrences of shared/specific in the code, this is a list:
<details><summary>Click to expand</summary>
#### With shared/specific translatable UI strings
These files contain UI strings that mention "shared" and/or "specific" to refer to runners.
```
app/views/shared/runners/_runner_type_alert.html.haml
app/views/shared/runners/_shared_runners_description.html.haml
app/views/groups/runners/_runner.html.haml
app/views/groups/runners/_group_runners.html.haml
app/views/projects/runners/_shared_runners.html.haml
app/views/projects/runners/_specific_runners.html.haml
app/assets/javascripts/runner/components/runner_type_alert.vue # docs link
app/assets/javascripts/group_settings/components/shared_runners_form.vue
app/assets/javascripts/projects/settings/components/shared_runners_toggle.vue
ee/app/views/admin/projects/_shared_runner_status.html.haml
ee/app/views/namespaces/_shared_runner_status.html.haml # docs link
ee/app/views/namespaces/_shared_runners_minutes_setting.html.haml
ee/app/assets/javascripts/jobs/components/shared_runner_limit_block.vue
```
#### Only in-code shared/specific naming
These files use filenames, variables, etc... that are specific. Leaving them unchanged is possible to close this issue, but it creates friction for contributors.
```
app/assets/javascripts/group_settings/mount_shared_runners.js
app/assets/javascripts/pages/shared/mount_runner_aws_deployments.js
app/assets/javascripts/projects/settings/components/shared_runners_toggle.vue
app/controllers/projects/runners_controller.rb
app/helpers/ci/runners_helper.rb
app/models/ci/runner.rb # may need databse action
app/services/groups/update_shared_runners_service.rb
app/views/groups/runners/_shared_runners.html.haml
app/views/projects/runners/_group_runners.html.haml
app/views/projects/runners/_index.html.haml
lib/api/ci/runner.rb
lib/api/ci/runners.rb
lib/api/entities/ci/runner.rb
lib/gitlab/background_migration/reset_shared_runners_for_transferred_projects.rb
qa/qa/specs/features/browser_ui/4_verify/runner/register_runner_spec.rb
spec/controllers/projects/runners_controller_spec.rb
spec/features/admin/admin_runners_spec.rb
spec/features/runners_spec.rb
spec/frontend/group_settings/components/shared_runners_form_spec.js
spec/frontend/projects/settings/components/shared_runners_toggle_spec.js
spec/frontend/runner/components/runner_list_spec.js
spec/frontend/runner/components/runner_list_spec.js
spec/frontend/runner/components/runner_manual_setup_help_spec.js
spec/frontend/runner/components/runner_type_alert_spec.js # docs link
spec/frontend/runner/components/runner_type_badge_spec.js
spec/frontend/runner/components/runner_type_help_spec.js
spec/frontend/runner/runner_detail/runner_details_app_spec.js
spec/graphql/resolvers/ci/runners_resolver_spec.rb
spec/helpers/ci/runners_helper_spec.rb
spec/lib/gitlab/background_migration/reset_shared_runners_for_transferred_projects_spec.rb
spec/models/ci/runner_spec.rb
spec/requests/api/ci/runner/jobs_artifacts_spec.rb
spec/requests/api/ci/runner/jobs_put_spec.rb # reference to setting (shared_runners_enabled)
spec/requests/api/ci/runner/jobs_request_post_spec.rb
spec/requests/api/ci/runner/jobs_trace_spec.rb
spec/requests/api/ci/runners_spec.rb
spec/services/groups/update_shared_runners_service_spec.rb
spec/views/projects/runners/_specific_runners.html.haml_spec.rb
spec/views/shared/runners/_runner_details.html.haml_spec.rb
ee/app/assets/javascripts/jobs/components/shared_runner_limit_block.vue
ee/app/helpers/ee/ci/runners_helper.rb
ee/app/services/clear_namespace_shared_runners_minutes_service.rb
ee/app/views/admin/application_settings/_shared_runners_minutes_setting.html.haml
ee/app/views/namespaces/_shared_runners_minutes_settings.html.haml
ee/app/views/shared/_shared_runners_minutes_limit_flash_message.html.haml
ee/app/views/shared/_shared_runners_minutes_limit.html.haml
ee/app/workers/clear_shared_runners_minutes_worker.rb
ee/lib/gitlab/ci/minutes/runners_availability.rb
ee/spec/controllers/projects/runners_controller_spec.rb
ee/spec/features/ci_shared_runner_settings_spec.rb
ee/spec/features/ci_shared_runner_warnings_spec.rb
ee/spec/fixtures/api/schemas/job/runners.json
ee/spec/frontend/jobs/shared_runner_limit_block_spec.js
ee/spec/frontend/projects/settings/components/shared_runners_toggle_spec.js
ee/spec/helpers/ee/ci/runners_helper_spec.rb
ee/spec/lib/gitlab/ci/minutes/runners_availability_spec.rb
ee/spec/requests/api/ci/runner/jobs_put_spec.rb
ee/spec/requests/api/ci/runner/jobs_trace_spec.rb
ee/spec/services/clear_namespace_shared_runners_minutes_service_spec.rb
ee/spec/workers/clear_shared_runners_minutes_worker_spec.rb
```
#### Codebase-wide search for variable names in the project
These should tend to 0!
```
shared_runners_enabled 338 results in 94 files
shared_runners_disabled 28 results in 6 files
shared_runner 1338 results in 243 files
specific_runner 64 results in 7 files
```
#### Docs (non extensive list)
```
doc/api/runners.md
doc/ci/runners/configure_runners.md
doc/ci/runners/index.md
doc/ci/runners/runners_scope.md
doc/ci/runners/build_cloud/linux_build_cloud.md
doc/ci/runners/build_cloud/windows_build_cloud.md
```
</details>
## Further details
This was from previous conversations:
We need to clarify the names of the runners we provide.
Shared runner was the initial name when we had only two types:
- `shared`, which was instance wide, available for all users
- `specific`, which was for one or more specific projects
In the implementation, the shared runner had `is_shared = true` set in the database.
Then we introduced the `group` type.
In the implementation, we migrated from a `boolean` field to an `enum` type, with the types named as `instance`, `group`, and `project`.
issue
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