Fix usdcat verification - use --help instead of --version

usdcat doesn't support --version flag. It requires input files and
exits with error "inputFiles is required" when run without arguments.

Changed all verification steps to use `usdcat --help` which properly
displays the help text and exits with success.

.github/workflows/linux_ci.yml

@@ -143,7 +143,7 @@ jobs:
 
     - name: Verify OpenUSD installation
       run: |
-        usdcat --version || usdcat --help
+        usdcat --help
         echo "OpenUSD binary: $(which usdcat)"
 
     - name: Test TinyUSDZ and OpenUSD interoperability
@@ -308,7 +308,7 @@ jobs:
 
     - name: Verify OpenUSD installation (ARM64)
       run: |
-        usdcat --version || usdcat --help
+        usdcat --help
         echo "OpenUSD binary: $(which usdcat)"
 
     - name: Test TinyUSDZ and OpenUSD interoperability (ARM64)

.github/workflows/macos_ci.yml

@@ -50,7 +50,7 @@ jobs:
 
       - name: Verify OpenUSD installation (macOS ARM64)
         run: |
-          usdcat --version || usdcat --help
+          usdcat --help
           echo "OpenUSD binary: $(which usdcat)"
 
       - name: Test TinyUSDZ and OpenUSD interoperability (macOS ARM64)

.github/workflows/windows_ci.yml

@@ -59,7 +59,7 @@ jobs:
 
       - name: Verify OpenUSD installation (Windows x64)
         run: |
-          usdcat --version
+          usdcat --help
           Write-Host "OpenUSD binary location: $(Get-Command usdcat | Select-Object -ExpandProperty Source)"
 
       - name: Test TinyUSDZ and OpenUSD interoperability (Windows x64)