ci: add deno install step before running tests

Add `deno install` command to install Deno dependencies before running
tests in all workflows. This ensures all required dependencies are
available when running the test suite.

Affected workflows:
- test.yml
- npm-publish.yml
- npm-publish-github-packages.yml
- jsr-publish.yml

Author: jarvisjiang

.github/workflows/jsr-publish.yml

@@ -21,6 +21,7 @@ jobs:
 
       - name: Run test cases
         uses: denoland/setup-deno@v2
+      - run: deno install
       - run: pnpm test
 
   publish-jsr:

.github/workflows/npm-publish-github-packages.yml

@@ -22,6 +22,7 @@ jobs:
 
       - name: Run test cases
         uses: denoland/setup-deno@v2
+      - run: deno install
       - run: pnpm test
 
   publish-gpr:

.github/workflows/npm-publish.yml

@@ -21,6 +21,7 @@ jobs:
 
       - name: Run test cases
         uses: denoland/setup-deno@v2
+      - run: deno install
       - run: pnpm test
 
   publish-npm:

.github/workflows/test.yml

@@ -23,6 +23,7 @@ jobs:
 
       - name: Run test cases
         uses: denoland/setup-deno@v2
+      - run: deno install
       - run: pnpm test
 
       - name: Upload coverage reports to Codecov