Implement AutomationCondition.replace() function (#27109)

## Summary & Motivation

Users often want to make small changes to the existing policies. There
is an existing utility to remove a sub-condition (`.without(…)`), and
you can add a new sub-condition with `&`.

However, these utilities aren't always the most ergonomic for certain
use cases.

This would allow the following types of changes to our examples:

[Older time window
partitions](https://docs.dagster.io/concepts/automation/declarative-automation/customizing-automation-conditions#update-an-older-time-partition-when-using-automationconditionon_cron)

before:

```python
condition = five_days_ago_condition & AutomationCondition.eager().without(
    AutomationCondition.in_latest_time_window(),
)
```

after:

```python
AutomationCondition.eager().replace(
    "in_latest_time_window", five_days_ago_condition
)
```

## How I Tested These Changes

Added unit tests.

## Changelog

Implemented `AutomationCondition.replace()` function to improve
ergonomics of updating sub-conditions.

python_modules/dagster/dagster/_core/definitions/declarative_automation/operators/boolean_operators.py

@@ -80,6 +80,25 @@ def replace(
             else copy(self, operands=[child.replace(old, new) for child in self.operands])
         )
 
+    @public
+    def replace(
+        self, old: Union[AutomationCondition, str], new: AutomationCondition
+    ) -> AutomationCondition:
+        """Replaces all instances of ``old`` across any sub-conditions with ``new``.
+
+        If ``old`` is a string, then conditions with a label matching
+        that string will be replaced.
+
+        Args:
+            old (Union[AutomationCondition, str]): The condition to replace.
+            new (AutomationCondition): The condition to replace with.
+        """
+        return (
+            new
+            if old in [self, self.get_label()]
+            else copy(self, operands=[child.replace(old, new) for child in self.operands])
+        )
+
 
 @whitelist_for_serdes(storage_name="OrAssetCondition")
 @record