Remove release timeline (#127685)

Fixes https://github.com/flutter/flutter/issues/127592

.github/ISSUE_TEMPLATE/7_cherry_pick.yml

@@ -6,17 +6,6 @@ assignees:
   - itsjustkevin
   - caseyhillers
 body:
-- type: markdown
-  attributes:
-      value: |
-        <!---
-        Flutter releases generally follow the given timeline:
-        1. On Tuesday at 10 AM PT the CP list will be finalized for the week's release
-          A. If there's any stable CPs, a stable release will be shipped.
-          B. Based on discretion of the release team, a beta hotfix may be shipped.
-        2. Tuesday the release engineer for the week will get the release prepped
-        3. Wednesday morning at 10 AM PT the release will be shipped
-        -->
   - type: input
     id: issue_link
     attributes: