Remove Gandalf workers and update Aragorn Pathfinder to go through Retriever

[maximusunc]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 60.46512% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.17%. Comparing base (6093c60) to head (46d68af).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
workers/aragorn_pathfinder/worker.py	59.25%	10 Missing and 1 partial ⚠️
workers/aragorn_lookup/worker.py	62.50%	3 Missing and 3 partials ⚠️

Files with missing lines	Coverage Δ
shepherd_server/base_routes.py	0.00% <ø> (ø)
shepherd_utils/shared.py	67.31% <ø> (ø)
workers/aragorn/worker.py	80.21% <ø> (ø)
workers/gandalf/worker.py	0.00% <ø> (ø)
workers/monitor/poller.py	0.00% <ø> (ø)
workers/aragorn_lookup/worker.py	71.10% <62.50%> (+1.66%)	⬆️
workers/aragorn_pathfinder/worker.py	67.52% <59.25%> (-4.65%)	⬇️

... and 1 file with indirect coverage changes

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