feat(secret-scanning): Forward alerts to Panther

[Jeffreyhung]

Requires https://github.com/getsentry/security-as-code/pull/989 to be merged first
Custom log source created in Panther, example log:

{
"event":"github_secret_scanning_failed",
createdAt:"2024-09-26T08:48:54Z",
"repo":"getsentry/jeffrey_test",
"pull_request":"https://github.com/getsentry/jeffrey_test/pull/11"",
"actor":"Jeffreyhung" 
}