chore: Introduce release notes formatting + preview release action (#7247)

### What
- Add changelog formatting file to automate pull request categorization in release notes*
- Add action to trigger preview releases
- Remove unused staging deployment action

**Add changelog formatting file to automate pull request categorization in release notes**

In order for this work, we need to be more strict about our labels usage. More specifically, we need to add one of the four different labels noted in the `release.yml` file. The labels should be self-explanatory. If your PR introduces both features and bugs, you should choose the label based on importance of the changes.

.github/release.yml

@@ -0,0 +1,20 @@
+changelog:
+  exclude:
+    authors:
+      - github-actions
+  categories:
+    - title: Features
+      labels:
+        - "type: feature"
+    - title: Bugs
+      labels:
+        - "type: bug"
+    - title: Documentation
+      labels:
+        - "type: docs"
+    - title: Chores
+      labels:
+        - "type: chore"
+    - title: Other Changes
+      labels:
+        - "*"

.github/workflows/trigger-release.yml

@@ -1,8 +1,18 @@
-name: Staging Release and Publish
+name: Trigger Release and Publish
 
 on:
-  # TODO: Enabling manual workflow triggering while in pre-release mode. Remove when 1.8 is released
   workflow_dispatch:
+    inputs:
+      version:
+        type: choice
+        default: 'preview'
+        description: What tag do you want to release?
+        required: true
+        options: 
+        - preview
+        - next
+        - snapshot
+        - canary
     branches:
       - develop
     paths-ignore:
@@ -15,7 +25,7 @@ concurrency: ${{ github.workflow }}-${{ github.ref }}
 
 jobs:
   release:
-    name: Staging Release
+    name: Trigger Release
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
@@ -44,7 +54,7 @@ jobs:
         run: yarn build
 
       - name: Version packages
-        run: yarn version:next
+        run: yarn changeset version --snapshot ${{ github.event.inputs.version }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
@@ -52,4 +62,4 @@ jobs:
         run: yarn install --no-immutable
         
       - name: Publish packages under next tag
-        run: yarn release:next
+        run: yarn changeset publish --no-git-tags --snapshot --tag ${{ github.event.inputs.version }}

.github/workflows/trigger-staging-release.yml

@@ -1,18 +0,0 @@
-name: Trigger staging deploy
-
-on:
-  workflow_run:
-    workflows: [Staging Release and Publish]
-    types:
-      - completed
-
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    steps:
-      - run: |
-          curl -X POST \
-          -H "Authorization: Bearer ${{secrets.STAGING_ACCESS_TOKEN}}" \
-          -H "Accept: application/vnd.github.v3+json" \
-          https://api.github.com/repos/@medusajs/medusa-staging/actions/workflows/deploy.yml/dispatches \
-          -d '{"ref":"main"}'