Introduce Backend fields
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Label this issue](https://contributors.gitlab.com/manage-issue?action=label&projectId=278964&issueIid=596019) </details> <!--IssueSummary end--> ### 1. Introduce Backend fields * [x] Migrations * [x] Add `consecutive_absence_count integer NOT NULL DEFAULT 0` to `analyzer_project_statuses` * [x] Add `stale bigint NOT NULL DEFAULT 0` to `analyzer_namespace_statuses` * [x] Add `:stale` to `Enums::Security.analyzer_statuses` * [x] Add validation for greater than 0 for `:stale` in `AnalyzerNamespaceStatus` model * [x] Update `ee/spec/factories/analyzer_namespace_statuses.rb` and failing specs * [x] Expose stale status on `AnalyzerProjectStatusType`
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