Web Interface for reviewing security workflow statuses

MUST: The web interface must provide an overview of the various workflows (recently completed, recently failed, in-process, waiting-decision) with easy navigation, sorting and filtering

The goal here is to provide the security / release team with an overview of their packages that need review or attention. This almost certainly needs some more requirements investigation via #394 (closed).

This feature should also cater to the needs of other teams with non-interactive workflows like the wanna-build team. They should be able to see all their "BuildAndUpload" workflows, analyze the recently failed ones and possibly retry the failed work requests, etc (see #379 (closed) for a related ticked dropped from M3).

Things to consider:

• should the workflow list (or workflow view) offer an easy way to open /work-request/ with a filter so that it lists only work requests that are inside a given workflow ? we already support a "status" filter there, we likely need more (at least workflow_parent, but maybe also by task_name, etc.)
• the entry point is likely some list of "WorkflowTemplate" because a given team will want to monitor all the workflows created out of a set of specific workflow templates.
• the list of workflows and work-requests should probably become workspace specific

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Included tasks:

• rework the web UI to be workspace centered (#557 (closed))
• rework the WAIT task creation to document the "needs_input" workflow_data key
  • Don't forget to update documentation
• add supplementary filters to /<scope>/<workspace>/work-request/
• create the new view/template for /<scope>/<workspace>/workflow/ (depends on #618 (closed) for the correct list)
• Save WorkflowTemplate.name in the created WorkRequest (#618 (closed)) (needed for the list of workflows)

Please refer to https://freexian-team.pages.debian.net/debusine/reference/devel-blueprints/monitor-workflows.html for details.