chore: split codecov jobs (#9748)

Signed-off-by: Charles-Edouard Brétéché <charles.edouard@nirmata.com>

.github/workflows/codecov.yaml

@@ -7,40 +7,59 @@ permissions: {}
 on:
   push:
     branches:
-      - '*'
+    - '*'
   pull_request:
     branches:
-      - 'main'
-      - 'release*'
+    - 'main'
+    - 'release*'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
-  codecov:
+  unit-tests:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - name: Setup caches
-        uses: ./.github/actions/setup-caches
-        timeout-minutes: 5
-        continue-on-error: true
-        with:
-          build-cache-key: codecov
-      - name: Setup build env
-        uses: ./.github/actions/setup-build-env
-        timeout-minutes: 10
-        with:
-          free-disk-space: false
-      - name: Generate Code Coverage Report
-        run: make code-cov-report
-      - name: Upload Report to Codecov
-        uses: codecov/codecov-action@e0b68c6749509c5f83f984dd99a76a1c1a231044 # v4.0.1
-        with:
-          files: ./coverage.out
-          fail_ci_if_error: true
-          verbose: true
-        env:
-          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+    - name: Checkout
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+    - name: Setup caches
+      uses: ./.github/actions/setup-caches
+      timeout-minutes: 5
+      continue-on-error: true
+      with:
+        build-cache-key: codecov
+    - name: Setup build env
+      uses: ./.github/actions/setup-build-env
+      timeout-minutes: 10
+      with:
+        free-disk-space: false
+    - name: Generate Code Coverage Report
+      run: make code-cov-report
+    - name: Upload coverage
+      uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
+      with:
+        name: coverage.out
+        path: coverage.out
+        retention-days: 1
+        if-no-files-found: error
+
+  upload-to-codecov:
+    needs:
+    - unit-tests
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+    - name: Download coverage
+      uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
+      with:
+        name: coverage.out
+    - name: Upload Report to Codecov
+      uses: codecov/codecov-action@e0b68c6749509c5f83f984dd99a76a1c1a231044 # v4.0.1
+      with:
+        files: ./coverage.out
+        fail_ci_if_error: true
+        verbose: true
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}