.github: set better job names

Signed-off-by: Dylan Bargatze <dylan@tailscale.com>

Author: dylan-tailscale

.github/workflows/python.yml

@@ -14,6 +14,7 @@ permissions:
 
 jobs:
   linux:
+    name: test (linux, ${{ matrix.platform.target }})
     runs-on: ${{ matrix.platform.runner }}
     strategy:
       matrix:
@@ -43,6 +44,7 @@ jobs:
           path: ts_python/dist
 
   macos:
+    name: test (macOS, ${{ matrix.platform.target }})
     runs-on: ${{ matrix.platform.runner }}
     strategy:
       matrix: