Add is_legacy column to handle webhook migration (#1813)
Legacy webhooks won't be editable at first. Keep data templates
compatibility.
Possible migration code:
```python
from apps.webhooks.models import Webhook
from apps.alerts.models import CustomButton, EscalationPolicy
custom_buttons = CustomButton.objects.all()
for cb in custom_buttons:
webhook, _ = Webhook.objects.get_or_create(
organization=cb.organization,
team=cb.team,
name=cb.name,
is_legacy=True,
defaults=dict(
created_at=cb.created_at,
url=cb.webhook,
username=cb.user,
password=cb.password,
authorization_header=cb.authorization_header,
trigger_type=Webhook.TRIGGER_ESCALATION_STEP,
forward_all=cb.forward_whole_payload,
data=cb.data,
)
)
# migrate related escalation policies
policies = EscalationPolicy.objects.filter(
step=EscalationPolicy.STEP_TRIGGER_CUSTOM_BUTTON,
custom_button_trigger=cb,
).update(
step=EscalationPolicy.STEP_TRIGGER_CUSTOM_WEBHOOK,
custom_webhook=webhook,
)
```
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