[core] force null timeout and interval

src/utils/SingleDelayedJobRunner.ts

@@ -30,10 +30,10 @@ export class SingleDelayedJobRunner {
     }
 
     this.timeout = setTimeout(() => {
+      this.timeout = null;
       this.logger.debug(`Running job...`);
       fn().finally(() => {
         this.logger.debug(`Job finished`);
-        this.timeout = null;
       });
     }, this.timeoutMs);
     this.logger.info(`Job scheduled with timeout ${this.timeoutMs} ms`);
@@ -42,6 +42,7 @@ export class SingleDelayedJobRunner {
 
   cancel() {
     clearTimeout(this.timeout);
+    this.timeout = null;
     this.logger.info(`Job cancelled`);
   }
 

src/utils/SinglePeriodicJobRunner.ts

@@ -51,6 +51,7 @@ export class SinglePeriodicJobRunner {
 
   stop() {
     clearInterval(this.interval);
+    this.interval = null;
     this.logger.info(`Job stopped`);
   }