remote/exporter: add poll tracking override

[Emantor]

Description

The poll() function tracks whether the local information has changed vs the previous state and only takes the availability into account. Since we now poll() the resource on creation, the local state is immediately updated with the information on the resource. This also means that instead of a "clear" by sending an unavailable resource, we don't send an update to the coordinator in case the resource is still available.

Previously:
Create Resource -> unavailable
poll() -> update to coordinator

Now:
create resource, poll() -> availability stays the same and we skip the information update to the coordinator.

Add an explicit override to the poll function to mark the state as dirty for the first poll().

Checklist

• PR has been tested

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.8%. Comparing base (2ce9e24) to head (86d1214).
⚠️ Report is 136 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1625     +/-   ##
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- Coverage    55.8%   55.8%   -0.1%     
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  Files         170     170             
  Lines       13382   13381      -1     
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- Hits         7469    7468      -1     
  Misses       5913    5913             

Flag	Coverage Δ
3.10	56.1% <100.0%> (-0.1%)	⬇️
3.11	56.1% <100.0%> (-0.1%)	⬇️
3.12	56.1% <100.0%> (-0.1%)	⬇️
3.13	56.0% <100.0%> (-0.1%)	⬇️
3.9	56.1% <100.0%> (-0.1%)	⬇️

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