Convert markdown issue template to yaml issue form

.github/ISSUE_TEMPLATE/bug_7.yml

@@ -0,0 +1,49 @@
+name: 🐞 Bug v7
+description: File a bug/issue against v7.x
+title: "[BUG] <title>"
+labels: [Bug, Needs Triage, Release 7.x]
+body:
+- type: checkboxes
+  attributes:
+    label: Is there an existing issue for this?
+    description: Please [search here](https://github.com/npm/cli/issues) to see if an issue already exists for your problem.
+    options:
+    - label: I have searched the existing issues
+      required: true
+- type: textarea
+  attributes:
+    label: Current Behavior
+    description: A clear & concise description of what you're experiencing.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Expected Behavior
+    description: A clear & concise description of what you expected to happen.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Steps To Reproduce
+    description: Steps to reproduce the behavior.
+    value: |
+      1. In this environment...
+      2. With this config...
+      3. Run '...'
+      4. See error...
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Environment
+    description: |
+      examples:
+        - **OS**: Ubuntu 20.04
+        - **Node**: 13.14.0
+        - **npm**: 7.6.3
+    value: |
+        - OS: 
+        - Node: 
+        - npm: 
+  validations:
+    required: false