ci: replace calls to setup node & pnpm with the shared setup-env action

Author: galargh

.github/workflows/v-next-changesets-release.yml

@@ -15,13 +15,9 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: pnpm/action-setup@v4
-        with:
-          version: 9
-      - uses: actions/setup-node@v4
+      - uses: ./.github/actions/setup-env
         with:
           node-version: 22
-          cache: "pnpm"
       - name: Install
         run: pnpm install --no-frozen-lockfile
       - name: Changeset Check
@@ -47,13 +43,9 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: pnpm/action-setup@v4
-        with:
-          version: 9
-      - uses: actions/setup-node@v4
+      - uses: ./.github/actions/setup-env
         with:
           node-version: 22
-          cache: "pnpm"
       - name: Install
         run: pnpm install --no-frozen-lockfile
       - name: Run full check (build, lint and test)
@@ -71,13 +63,9 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: pnpm/action-setup@v4
-        with:
-          version: 9
-      - uses: actions/setup-node@v4
+      - uses: ./.github/actions/setup-env
         with:
           node-version: 22
-          cache: "pnpm"
       - name: Install
         run: pnpm install --no-frozen-lockfile
       - name: Apply and commit changesets

.github/workflows/v-next-ci.yml

@@ -65,14 +65,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Install pnpm
-        uses: pnpm/action-setup@v3
-        with:
-          version: 9
-      - uses: actions/setup-node@v4
+      - uses: ./.github/actions/setup-env
         with:
           node-version: 22
-          cache: "pnpm"
       - name: Install dependencies
         run: pnpm install --frozen-lockfile --prefer-offline
       - name: Build
@@ -98,14 +93,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Install pnpm
-        uses: pnpm/action-setup@v3
-        with:
-          version: 9
-      - uses: actions/setup-node@v4
+      - uses: ./.github/actions/setup-env
         with:
           node-version: ${{ matrix.node }}
-          cache: "pnpm"
       - name: Install dependencies
         run: pnpm install --frozen-lockfile --prefer-offline
       - name: Build