[#212] reputationsvc: Resolve linters and rename

Resolved containedctx linters.
Renamed context structs and interfaces to more understandble names.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/reputation/eigentrust/iteration.go

@@ -1,8 +1,6 @@
 package eigentrust
 
 import (
-	"context"
-
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/reputation"
 )
 
@@ -36,22 +34,11 @@ type IterationTrust struct {
 	reputation.Trust
 }
 
-// IterContext aggregates context and data required for
-// iterations.
-// nolint: containedctx
-type IterContext struct {
-	context.Context
-	EpochIteration
-}
-
-func NewIterContext(ctx context.Context, epoch uint64, iter uint32) *IterContext {
+func NewEpochIteration(epoch uint64, iter uint32) *EpochIteration {
 	ei := EpochIteration{}
 
 	ei.SetI(iter)
 	ei.SetEpoch(epoch)
 
-	return &IterContext{
-		Context:        ctx,
-		EpochIteration: ei,
-	}
+	return &ei
 }