fix(shard-distributor): remove trimming of prefixes (#7490)

<!-- Describe what has changed in this PR -->
**What changed?**
Reverting the trimprefix since we are using constants to compare the
values that include that

<!-- Tell your future self why have you made these changes -->
**Why?**
Constants that include the prefix are used to 

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test? Checked in staging env? -->
**How did you test it?**
Deployed in staging

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change to production? -->
**Potential risks**
Corruption of db, which is already the case.

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**Release notes**

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**Documentation Changes**

---------

Signed-off-by: edigregorio <[email protected]>

Author: eleonoradgr

common/types/sharddistributor.go

@@ -24,7 +24,7 @@ package types
 
 import "fmt"
 
-//go:generate enumer -type=ExecutorStatus,ShardStatus,AssignmentStatus,MigrationMode -trimprefix=ExecutorStatus,ShardStatus,AssignmentStatus,MigrationMode -json -output sharddistributor_statuses_enumer_generated.go
+//go:generate enumer -type=ExecutorStatus,ShardStatus,AssignmentStatus,MigrationMode -json -output sharddistributor_statuses_enumer_generated.go
 
 type GetShardOwnerRequest struct {
 	ShardKey  string

common/types/sharddistributor_statuses_enumer_generated.go

@@ -112,7 +112,7 @@ func TestAssignedState_FromAssignedState(t *testing.T) {
 }
 
 func TestAssignedState_JSONMarshalling(t *testing.T) {
-	const jsonStr = `{"assigned_shards":{"1":{"status":"READY"}},"last_updated":"2025-11-18T12:00:00.123456789Z","mod_revision":42}`
+	const jsonStr = `{"assigned_shards":{"1":{"status":"AssignmentStatusREADY"}},"last_updated":"2025-11-18T12:00:00.123456789Z","mod_revision":42}`
 
 	state := &AssignedState{
 		AssignedShards: map[string]*types.ShardAssignment{