chore: add title format and "needs triage" label in issue temp… (#18717)

Author: mmalerba

.github/ISSUE_TEMPLATE.md

@@ -1,3 +1,8 @@
+---
+title: "issue([COMPONENT]): [TITLE]"
+labels: needs triage
+---
+
 #### Bug, feature request, or proposal:
 
 

.github/ISSUE_TEMPLATE/bug.md

@@ -1,6 +1,8 @@
 ---
 name: Bug Report
+title: "bug([COMPONENT]): [TITLE]"
 about: Report a bug found in Angular Material or the CDK
+labels: needs triage
 ---
 
 #### Reproduction

.github/ISSUE_TEMPLATE/docs.md

@@ -1,7 +1,8 @@
 ---
 name: Documentation
+title: "docs-bug([COMPONENT]): [TITLE]"
 about: Suggest an improvement to our documentation at material.angular.io
-labels: docs
+labels: docs, needs triage
 ---
 
 #### Documentation Feedback

.github/ISSUE_TEMPLATE/feature.md

@@ -1,7 +1,8 @@
 ---
 name: Feature
+title: "fr([COMPONENT]): [TITLE]"
 about: Propose a new feature for Angular Material or the CDK
-labels: feature
+labels: feature, needs triage
 ---
 
 #### Feature Description

.github/ISSUE_TEMPLATE/troubleshooting.md

@@ -1,7 +1,8 @@
 ---
 name: Troubleshooting
+title: "help([COMPONENT]): [TITLE]"
 about: Request for help on an issue you are facing with Angular Material or the CDK
-labels: troubleshooting
+labels: troubleshooting, needs triage
 ---
 
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