[MM-39999] Increase key length in plugin KV store to 150 (#19002)

model/plugin_key_value.go

@@ -10,7 +10,7 @@ import (
 
 const (
 	KeyValuePluginIdMaxRunes = 190
-	KeyValueKeyMaxRunes      = 50
+	KeyValueKeyMaxRunes      = 150
 )
 
 type PluginKeyValue struct {

model/plugin_key_value_test.go

@@ -20,6 +20,6 @@ func TestPluginKeyIsValid(t *testing.T) {
 	kv.Key = ""
 	assert.NotNil(t, kv.IsValid())
 
-	kv.Key = "this is an extremely long key and should be invalid and this is being verified in this test"
+	kv.Key = "this is an extremely long, long, long, long, long, long, long, long, long, long, long, long, long key and should be invalid and this is being verified in this test"
 	assert.NotNil(t, kv.IsValid())
 }