Squad

This 1.25.1 release fixes a bug that caused broken links to show
up in default notification templates.

Complete list of changes going in:

* core: templates: notification: Fix broken links

This 1.25 release adds a few major items:

* adds support of "unit" for metrics, but still preserves backwards compatibility
* api:
* standardizes API to use self discoverable url instead of id for all endpoints
* handles http errors as Json, instead of regular Django pages
* prepare squad to get test name column removed by making the field nullable
and stop using it
* adds option to disable sending emails to admins in setups that use other types of
notification, e.g. Sentry
* adds support for celery result backends, which allows celery to run group of tasks

Complete list of changes going in:

* api:
* rest: sandardize url-id in rest api
* http: handle 404 as json on api requests
* core:
* models: add unit field to Metric model
* models: add shortcut to get project settings
* migrations: "rebased" migration to make test name nullable
* models: use SuiteMetadata.name in favor of Test.name
* plugins:
* gerrit: add support to custom labels
* gerrit: allow multiple labels review
* settings:
* add celery result backend
* add option to turn off admin error emails
* fix SQUAD_SEND_ADMIN_ERROR_EMAIL flag values
* test: remove leftover print

This 1.24 release adds "tests" to suite endpoints, makes
test job endpoint a bit faster to load and fix the recently
added "Known Issues" project tab.

Complete list of changes going in:

* api: rest: defer definition from TestJob endpoint
* api: rest: add tests endpoint to suite view
* frontend: fix missing project nav in knownissues
* test: fix gerrit unit tests

This 1.23 release adds a few items to frontend: download attachments
button right on build view, download metric charts and known issues on
project view.

The release also changes task id for fetch tasks, this will help debugging
fetch-related errors.

Complete list of changes going in:

* ci: tasks: define task_id for fetch tasks
* core:
* frontend add group 'privileged' access level
* make PatchSource.token nullable
* frontend:
* Fix a typo on the delete project button
* add known issues to project view
* export metrics graphs as picture
* rest: add dropdown to download attachments

This 1.22 release increase metric name field from 100 characters
to 256, as it is for test name. The release also allows by default
all users to make changes to projects, as long as they belong
to the respective group.

Complete list of changes going in:

* core:
* make metric name 256 characteres long instead of 100
* add project perms to default squad group
* migrations: remove print creating permissions

This 1.21 release changes the lava backend XML-RPC
transport layer to use requests, also including a pre-defined
timeout. The release adds Celery plugin for Sentry users.

Complete list of changes going in:

* ci: add tests for LAVA backend call timeouts
* ci: lava: change XML-RPC transport to use requests
* frontent: build: include test jobs with no status in Test jobs tab
* settings: add CeleryIntegration to sentry