[tiagolobocastro]

test(analytics): cover the leader election and ping races

Add unit tests for the analytics lease election, using an in-memory API
server which enforces the resourceVersion, and for the ping loop, using
an in-memory configmap:

- concurrent acquires of a free lease: one wins, the other gets a 409
- an unexpired lease is not taken, an expired one is taken over
- a failing leader steps down right away, the others take over only
  once the lease expires
- a paused leader (stale renewal) neither leads nor pings, while the
  new leader carries on the schedule without a new install event
- a ping is skipped and rescheduled if another leader pinged meanwhile
- a regained leader resumes from the other leader's last ping

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fix(analytics): send ping from the node plugin lease holder

The install/ping events were sent from the controller, so disabling the
components which need it (eg: resize) stopped them altogether. Sending
them from every node plugin instead would show up as duplicates.

Run the analytics from the node plugins, where a Lease based leader
election (rawfile-analytics) picks a single sender. The lease lasts 180s
and is renewed every 60s; on any error leadership is dropped right away.
Followers take over once the lease expires, resuming the ping schedule
from the timestamps in the rawfile-config configmap, so no new install
event is sent.

To avoid duplicate pings, before sending one we also check that the
lease was renewed recently (a paused leader may resume still believing
it leads), and re-read the last ping timestamp from the configmap in
case another leader pinged meanwhile.

The analytics ClusterRole gains create/get/update on leases.

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