create cherry-pick template (#100158)

* create cherry-pick template

* Remove placeholders for all required fields

.github/ISSUE_TEMPLATE/7_cherry_pick.yml

+name: Request a cherry-pick.
+description: As a contributor, you would like to request that a feature be cherry-picked into a release.
+title: '[CP] <title>'
+labels: ['cp: review']
+body:
+  - type: input
+    id: issue_link
+    attributes:
+      label: issue_link
+      description: What is the link to the issue this cherry-pick is addressing?
+    validations:
+      required: true
+  - type: input
+    id: commit_hash
+    attributes:
+      label: Commit Hash
+      description: What is the shortened commit hash that has been merged to master/main?
+    validations:
+      required: true
+  - type: input
+    id: impacted_users
+    attributes:
+      label: Impacted Users
+      description: Approximately who will hit this issue (ex. all Flutter devs, Windows developers, all end-customers, apps using X framework feature)?
+    validations:
+      required: true
+  - type: textarea
+    id: impact_description
+    attributes:
+      label: Impact Description
+      description: What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)
+    validations:
+      required: true
+  - type: textarea
+    id: workaround
+    attributes:
+      label: Workaround
+      description: Is there a workaround for this issue?
+    validations:
+      required: true
+  - type: dropdown
+    id: risk
+    attributes:
+      label: Risk
+      description: What is the risk level of this cherry-pick?
+      options:
+        - low
+        - medium
+        - high
+    validations:
+      required: true
+  - type: dropdown
+    id: test_coverage
+    attributes:
+      label: Test Coverage
+      description: Are you confident that your fix is well-tested by automated tests?
+      options:
+        - "yes"
+        - "no"
+    validations:
+      required: true
+  - type: textarea
+    id: fix_steps
+    attributes:
+      label: Validation Steps
+      description: What are the steps to validate that this fix works?