Move Expected/Error from internal -> core

[ryanolson]

No description provided.

[codecov]

Codecov Report

Merging #263 (cb51342) into branch-23.01 (0151a7a) will decrease coverage by 0.02%.
The diff coverage is 66.66%.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-23.01     #263      +/-   ##
================================================
- Coverage         72.52%   72.49%   -0.03%     
================================================
  Files               376      376              
  Lines             12082    12082              
  Branches            921      921              
================================================
- Hits               8762     8759       -3     
- Misses             3320     3323       +3     

Flag	Coverage Δ
cpp	69.32% <66.66%> (-0.04%)	⬇️
py	38.32% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cpp/mrc/include/mrc/core/expected.hpp	71.02% <ø> (ø)
cpp/mrc/src/internal/control_plane/client.hpp	68.96% <ø> (ø)
...ernal/control_plane/client/connections_manager.cpp	70.42% <ø> (ø)
...rc/internal/control_plane/client/state_manager.cpp	86.66% <ø> (ø)
...rnal/control_plane/client/subscription_service.cpp	0.00% <ø> (ø)
...p/mrc/src/internal/control_plane/proto_helpers.hpp	40.00% <ø> (ø)
cpp/mrc/src/internal/control_plane/server.cpp	40.06% <0.00%> (ø)
cpp/mrc/src/internal/control_plane/server.hpp	100.00% <ø> (ø)
cpp/mrc/src/tests/test_expected.cpp	85.41% <ø> (ø)
cpp/mrc/include/mrc/core/error.hpp	83.33% <100.00%> (ø)
... and 5 more

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[mdemoret-nv]

/merge