refactor: Add load_from_db attribute to SecretStrInput class

The code changes in inputs.py add a new attribute `load_from_db` to the `SecretStrInput` class. This attribute controls whether the input should be loaded from the database or not. By default, it is set to `True`. This refactor improves the flexibility and configurability of the code.

src/backend/base/langflow/inputs/inputs.py

@@ -190,6 +190,7 @@ class SecretStrInput(BaseInputMixin, DatabaseLoadMixin):
     field_type: Optional[SerializableFieldTypes] = FieldTypes.PASSWORD
     password: CoalesceBool = Field(default=True)
     input_types: list[str] = []
+    load_from_db: CoalesceBool = True
 
 
 class IntInput(BaseInputMixin, ListableInputMixin, RangeMixin):