fix jinja_template values to int (#5132)

# What this PR does

this values must be int, OS setting it like strings, this PR fix it
using getenv_integer()

engine/settings/base.py

@@ -830,9 +830,9 @@ class BrokerTypes:
 
 GRAFANA_INCIDENT_STATIC_API_KEY = os.environ.get("GRAFANA_INCIDENT_STATIC_API_KEY", None)
 
-JINJA_TEMPLATE_MAX_LENGTH = os.getenv("JINJA_TEMPLATE_MAX_LENGTH", 50000)
-JINJA_RESULT_TITLE_MAX_LENGTH = os.getenv("JINJA_RESULT_TITLE_MAX_LENGTH", 500)
-JINJA_RESULT_MAX_LENGTH = os.getenv("JINJA_RESULT_MAX_LENGTH", 50000)
+JINJA_TEMPLATE_MAX_LENGTH = getenv_integer("JINJA_TEMPLATE_MAX_LENGTH", 50000)
+JINJA_RESULT_TITLE_MAX_LENGTH = getenv_integer("JINJA_RESULT_TITLE_MAX_LENGTH", 500)
+JINJA_RESULT_MAX_LENGTH = getenv_integer("JINJA_RESULT_MAX_LENGTH", 50000)
 
 # Log inbound/outbound calls as slow=1 if they exceed threshold
 SLOW_THRESHOLD_SECONDS = getenv_float("SLOW_THRESHOLD_SECONDS", 2.0)