* Use event definitions
* By default, track as little as possible
    * No extra context required
* Cover untracked controller methods

Fixes: gitlab-org/incubation-engineering/five-minute-production/meta#99

- Move methods to base_controller.rb
- Reuse them across gcp_regions_controller.rb
  and service_accounts_controller.rb

..for the incubation-5mp-google-cloud feature flag.

This will give us control to enable / disable
this feature on gitlab.com for specific projects,
groups and/or users.

..by removing the `project` param

- Use snowplow to track all success and error events
in the backend related to `Projects::GoogleCloud`

- Update tests to verify tracking of events

Sri Rang authored 3 years ago and Paul Slaughter committed 3 years ago

- Feature flag `incubation_5mp_google_cloud` bound to Project
  This allows for easier testing on gitlab.com where the feature
  flag may be enabled for select projects.

- `service_accounts` is an active route for `google_cloud` menu item
  This expands the appropriate project sidemenu item when creating
  a service account

- Introduce a top level `app.vue` component
  Achieves consistency with a majority of frontend code in the repo
  Where a single route with a single entry point serves multiple templates
  Instead of routing the frontend in `index.js` use a top level component
  to render the appropriate `screen`

!75295

The only category here which was used was `google_cloud`, but I can't
find that on our website. I think it belongs to
`five_minute_production_app`:
https://about.gitlab.com/handbook/engineering/incubation/5-min-production/

- `BaseController` for all `google_cloud` requests
    - `GoogleCloudController` extends `BaseController`

- `ServiceAccountsController`
    - Perform Google OAuth2 on access
    - Flash alert on decline

- `ServiceAccounts # index` renders ID placeholder to show form
    - User's GCP projects are fetched
    - If `cloudresourcemanager` API is enabled, else alert user
        - Alert if no GCP projects found for user
    - Render `gcp_projects` and project `environments` for vue component

- `ServiceAccounts # create` creates service accounts
    - If `iam` API is enabled, else alert user
    - Receives selected GCP project and Environment from form submission
    - Creates service account and service account key
    - Stores GCP project id, service account and key as project CI vars
    - Redirect to `project/google_cloud` main page