Restore removed (but used) methods in common.sql (#27843)

* Restore removed (but used) methods in common.sql

Unfortunately two of the methods that have been removed in #26761
have been used in Google Provider 8.4.0

Those methods should be restored and 1.3.0 version of the
common.sql has to be yanked to get rid of the problem when
Bigquery is broken by common.sql

Fixes: #27838

airflow/providers/common/sql/operators/sql.py

@@ -51,6 +51,35 @@ def _parse_boolean(val: str) -> str | bool:
     raise ValueError(f"{val!r} is not a boolean-like string value")
 
 
+def _get_failed_checks(checks, col=None):
+    """
+    IMPORTANT!!! Keep it for compatibility with released 8.4.0 version of google provider.
+
+    Unfortunately the provider used _get_failed_checks and parse_boolean as imports and we should
+    keep those methods to avoid 8.4.0 version from failing.
+    """
+    if col:
+        return [
+            f"Column: {col}\nCheck: {check},\nCheck Values: {check_values}\n"
+            for check, check_values in checks.items()
+            if not check_values["success"]
+        ]
+    return [
+        f"\tCheck: {check},\n\tCheck Values: {check_values}\n"
+        for check, check_values in checks.items()
+        if not check_values["success"]
+    ]
+
+
+parse_boolean = _parse_boolean
+"""
+IMPORTANT!!! Keep it for compatibility with released 8.4.0 version of google provider.
+
+Unfortunately the provider used _get_failed_checks and parse_boolean as imports and we should
+keep those methods to avoid 8.4.0 version from failing.
+"""
+
+
 _PROVIDERS_MATCHER = re.compile(r"airflow\.providers\.(.*)\.hooks.*")
 
 _MIN_SUPPORTED_PROVIDERS_VERSION = {