[elastic_agent] Create a dashboard that displays details for agent activity

[kpollich]

In 8.5.0, Fleet added an initial implementation of the agent activity flyout view - elastic/kibana#140267. This flyout is great, and we soon followed up with numerous enhancements in elastic/kibana#141206. We've also got further enhancements planned in elastic/kibana#153232.

Something that may be worth considering that isn't captured in the above issues is a Kibana dashboard focused on agent activity. I don't believe we've built a dashboard that depends on data in .fleet* indices to date, but it could be worth exploring some visualizations and better representation of action data over a time window. For example, we could build visualizations for the number of agents in each upgrade state, or the progress of agents in a given rollout window, or the number of batches pending for a given bulk upgrade.

Tasks

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1. Create visualization for number of agents in each upgrade status
2. Create visualization for recent bulk actions + results

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[kpollich]

Since we've landed a lot of impactful improvements around agent activity in elastic/kibana#153232, we're deprioritizing a new set of visualizations in favor of those flyout improvements within Fleet UI.

[kpollich]

I don't know that we'll prioritize this at all in light of the many enhancements we've made to the agent activity flyout in recent releases. Closing for now.