feat(docker/ci): migrate Docker and CI from npm to bun

Docker changes:
- Use oven/bun:1-debian as base image instead of node:20-trixie-slim
- Replace npm ci with bun install --frozen-lockfile
- Replace npm run commands with bun run
- Mount bun.lock instead of package-lock.json
- Update cache paths for Bun's cache directory
- Rename NPM_RUN_PRUNE env var to BUN_RUN_PRUNE

CI workflow changes:
- Update bashlib.sh npm-install function to use bun
- Update superset-frontend.yml to use bun run commands
- Update release.yml to use setup-bun action and changesets
- Update superset-e2e.yml to use setup-bun action
- Update superset-playwright.yml to use setup-bun action
- Update superset-translations.yml to use setup-bun action

Note: superset-embedded-sdk and superset-websocket remain on npm
as they are separate packages with their own lockfiles.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/superset-e2e.yml

@@ -107,12 +107,12 @@ jobs:
         uses: ./.github/actions/cached-dependencies
         with:
           run: testdata
-      - name: Setup Node.js
+      - name: Setup Bun
         if: steps.check.outputs.python || steps.check.outputs.frontend
-        uses: actions/setup-node@v6
+        uses: oven-sh/setup-bun@v2
         with:
-          node-version-file: './superset-frontend/.nvmrc'
-      - name: Install npm dependencies
+          bun-version: latest
+      - name: Install dependencies
         if: steps.check.outputs.python || steps.check.outputs.frontend
         uses: ./.github/actions/cached-dependencies
         with:
@@ -224,12 +224,12 @@ jobs:
         uses: ./.github/actions/cached-dependencies
         with:
           run: playwright_testdata
-      - name: Setup Node.js
+      - name: Setup Bun
         if: steps.check.outputs.python || steps.check.outputs.frontend
-        uses: actions/setup-node@v6
+        uses: oven-sh/setup-bun@v2
         with:
-          node-version-file: './superset-frontend/.nvmrc'
-      - name: Install npm dependencies
+          bun-version: latest
+      - name: Install dependencies
         if: steps.check.outputs.python || steps.check.outputs.frontend
         uses: ./.github/actions/cached-dependencies
         with: