Squad

* frontend:
* improve footer wording
* Group testresults by suite and env in build page
* api:
* add Test object and more filtering options
* core:
* ProjectStatus: cache test run counts. This provides a large speedup to the
project page.
* ci:
* lava: fix case when LAVA fails to provide `error_type`

* core:
* ProjectStatus: correctly handle 0 `expected_test_runs`
* detect changes from 'fail' to 'pass'
* frontend:
* add SVG badge as separate view
* api:
* add endpoint for PatchSource object
* make all 'id' fields read-only
* expose 'finished' flag to Build
* ci:
* lava: prevent password leaking in error messages
* scripts:
* add squad-config script for managing external config

This release provides the proper artifacts for SQUAD 0.46

The release artifacts for this version are incorrect, and should not be used.

The release artifacts for this version are incorrect, and should not be used.

* api:
* fix crash when accessing TestRun.Metrics
* add endpoint for KnownIssue object
* order build results by ascending instead of descending
* ci/Backend: allow disabling polls
* ci/admin: show poll_interval and max_fetch_attempts in Backend listing
* core:
* add tests for KnownIssues
* display known issues in email notifications
* limit Project.enabled_plugins_list to applicable plugins
* limit PatchSource.implementation to related plugins
* Add KnownIssue model class
* frontend:
* Improve TestRun and TestSuite pages
* remove 'Build' and 'Test Run' from the page header
* display when known issue is intermittent
* display known issues in light orange
* test history: display known issues
* display Known issues in test results page
* build page: sort test runs by suite slug
* plugins:
* add Github build status notification plugin
* add optional `features` option to plugin fields
* add get_plugins_by_feature
* split core plugin support from builtin plugins

* ci/admin: only link to test job with valid URL
* settings: fix periodic tasks schedule