Add duplicate-check to issue templates (#3092)

* Update Bug-report.yml

* Update Enhancement-idea.yml

* Update Enhancement-idea.yml

* Update Bug-report.yml

.github/ISSUE_TEMPLATE/Bug-report.yml

@@ -12,6 +12,8 @@ body:
           required: true
         - label: I also read **[Setting-up](https://github.com/JustArchiNET/ArchiSteamFarm/wiki/Setting-up)** and **[FAQ](https://github.com/JustArchiNET/ArchiSteamFarm/wiki/FAQ)**, I don't need **[help](https://github.com/JustArchiNET/ArchiSteamFarm/blob/main/.github/SUPPORT.md)**, this is a bug report
           required: true
+        - label: This is not a **[duplicate](https://github.com/JustArchiNET/ArchiSteamFarm/issues?q=is%3Aissue)** of an existing issue
+          required: true
         - label: I don't own more than **[10 accounts in total](https://github.com/JustArchiNET/ArchiSteamFarm/wiki/FAQ#how-many-bots-can-i-run-with-asf)**
           required: true
         - label: I'm not using **[custom plugins](https://github.com/JustArchiNET/ArchiSteamFarm/wiki/Plugins)**

.github/ISSUE_TEMPLATE/Enhancement-idea.yml

@@ -12,6 +12,8 @@ body:
           required: true
         - label: I also read **[Setting-up](https://github.com/JustArchiNET/ArchiSteamFarm/wiki/Setting-up)** and **[FAQ](https://github.com/JustArchiNET/ArchiSteamFarm/wiki/FAQ)**, I don't need **[help](https://github.com/JustArchiNET/ArchiSteamFarm/blob/main/.github/SUPPORT.md)**, this is an enhancement idea
           required: true
+        - label: This is not a **[duplicate](https://github.com/JustArchiNET/ArchiSteamFarm/issues?q=is%3Aissue)** of an existing issue
+          required: true
         - label: My idea doesn't duplicate existing ASF functionality described on the **[wiki](https://github.com/JustArchiNET/ArchiSteamFarm/wiki)**
           required: true
         - label: I believe that my idea falls into ASF's scope and should be offered as part of ASF built-in functionality