pass flavor input through to artifact name

Author: gagika

.github/workflows/run_tests_against_package.yml

@@ -19,6 +19,11 @@ name: Run Tests Against MaxText Package
 on:
   workflow_call:
     inputs:
+      flavor:
+        description: 'Test flavor name (e.g. cpu-unit, tpu-unit) - used for artifact naming'
+        required: false
+        type: string
+        default: ''
       device_type:
         required: true
         type: string

.github/workflows/run_tests_coordinator.yml

@@ -61,6 +61,7 @@ jobs:
 
     uses: ./.github/workflows/run_tests_against_package.yml
     with:
+      flavor: ${{ inputs.flavor }}
       # Infrastructure Mapping
       device_type: >-
         ${{ fromJSON('{