dashboard/app: add uncc command

Add "#syz uncc" command as a safety handle.
The command allows sender to unsubscribe from all future communication on the bug.

Linus mentioned possibility of saying "I'm not the right person for this report"
in the context of bug reminders:
https://groups.google.com/d/msg/syzkaller/zYlQ-b-QPHQ/AJzpeObcBAAJ

1 files changed, 11 insertions, 0 deletions

diff --git a/pkg/email/parser.go b/pkg/email/parser.go
index 1b2dbc747..ce652c5da 100644
--- a/pkg/email/parser.go
+++ b/pkg/email/parser.go
@@ -330,3 +330,14 @@ func MergeEmailLists(lists ...[]string) []string {
 	}
 	return result
 }
+
+func RemoveFromEmailList(list []string, toRemove string) []string {
+	var result []string
+	toRemove = CanonicalEmail(toRemove)
+	for _, email := range list {
+		if CanonicalEmail(email) != toRemove {
+			result = append(result, email)
+		}
+	}
+	return result
+}