CI: show curl tool and libcurl sizes

To see how they change throughout code and/or build changes.

Also:
- improve `file` output.
- tidy-ups.

Closes #20355

.github/workflows/http3-linux.yml

@@ -671,7 +671,10 @@ jobs:
           fi
 
       - name: 'curl -V'
-        run: bld/src/curl --disable -V
+        run: |
+          find . -type f \( -name curl -o -name '*.so.*' -o -name '*.a' \) -print0 | xargs -0 file --
+          find . -type f \( -name curl -o -name '*.so.*' -o -name '*.a' \) -print0 | xargs -0 stat -c '%10s bytes: %n' --
+          bld/src/curl --disable -V
 
       - name: 'build tests'
         if: ${{ !contains(matrix.build.install_steps, 'skipall') }}