[github] cleanup issue template (#10147)

Instead of assignees, we're going to simply "watch" the entire repo going forward.

Author: jonathanpeppers

.github/ISSUE_TEMPLATE/01-building-an-application.yml

@@ -1,7 +1,6 @@
 name: 🛠 Building an Application
 description: Issues trying to compile or package your application.
 labels: ["Area: App+Library Build", "needs-triage"]
-assignees: ["jonathanpeppers"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/02-running-an-application.yml

@@ -1,7 +1,6 @@
 name: 🏃‍♀️ Running an Application
 description: Issues trying to run your application, like crashes on device or in the emulator.
 labels: ["Area: App Runtime", "needs-triage"]
-assignees: ["grendello"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/03-mono-android-api.yml

@@ -1,7 +1,6 @@
 name: 🤖 Android API
 description: Issues with the Android API exposed in Mono.Android.
 labels: ["Area: Mono.Android", "needs-triage"]
-assignees: ["jpobst"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/04-binding-a-java-library.yml

@@ -1,7 +1,6 @@
 name: ☕ Binding an Android Library
 description: Issues trying to bind an Android library using an Android Bindings project.
 labels: ["Area: Mono.Bindings", "needs-triage"]
-assignees: ["jpobst"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/05-other.yml

@@ -1,7 +1,6 @@
 name: 🐛 Other
 description: Not sure where your issue fits? We'll direct it the right place!
 labels: ["needs-triage"]
-assignees: ["jpobst"]
 body:
   - type: markdown
     attributes: