UBER-174: Introduce createOn every there (#3222)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>

dev/generator/src/issues.ts

@@ -35,8 +35,7 @@ const object: AttachedData<Issue> = {
   reportedTime: 0,
   estimation: 0,
   reports: 0,
-  childInfo: [],
-  createOn: Date.now()
+  childInfo: []
 }
 
 export interface IssueOptions {
@@ -98,8 +97,7 @@ async function genIssue (client: TxOperations, statuses: Ref<IssueStatus>[]): Pr
     estimation: object.estimation,
     reports: 0,
     relations: [],
-    childInfo: [],
-    createOn: Date.now()
+    childInfo: []
   }
   await client.addCollection(
     tracker.class.Issue,