Tag Management MVP: Inspecting Usage

[msymons]

Current Behavior

See #586 for a statement of the overall challenges involved with working with tags and the need to be able to implement tag management.

Since the original issue was logged, the usage of tags has increased. For example, upcoming functionality in v4.12 will offer notification tagging,

The first part of managing tags is to provide a mechanism for "tag visibility": the ability to (easily) find out exactly how tags are actually being used.

This is currently not possible. For instance, in the UI:

• If you inspect a project you can see what tags it has. Clicking on any one tag will give you a filtered project view that displays al projects with that tag. But this can take a long time to inspect multiple tags and tells you nothing about whether there are tags available that have not been associated with any project
• If you inspect policies you can see tag usage on individual policies... but, again, there is no "big picture"

Proposed Behavior

Per comment in #586, implement an MVP that delivers tag reporting.... something that can be delivered speedily.

The implementation should make it possible to view al tags in a table and see counts (with links) to usage (projects and policies)

Checklist

• [X] I have read and understand the contributing guidelines
• [X] I have checked the existing issues for whether this enhancement was already requested

[github-actions[bot]]

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