ci: No draft releases when using 'run-bundling' (#28596)

Improve the logic in around release artifact bundling.
- Suppress a harmless "error: no such command: `about`" from
script/generate-licenes output
- Remove checks for main branch (which will never be true)
- Only run `Upload Artifacts to release` when not using `run-bundling`.
Prevents the creation of draft releases with just linux remote server binaries)

Release Notes:

- N/A

script/generate-licenses

@@ -18,7 +18,7 @@ echo -n "" >"$OUTPUT_FILE"
     echo -e "\n# ###### CODE LICENSES ######\n"
 } >>"$OUTPUT_FILE"
 
-if ! cargo about --version | grep "cargo-about $CARGO_ABOUT_VERSION" 2>&1 >/dev/null; then
+if ! cargo about --version | grep "cargo-about $CARGO_ABOUT_VERSION" &>/dev/null; then
     echo "Installing cargo-about@^$CARGO_ABOUT_VERSION..."
     cargo install "cargo-about@^$CARGO_ABOUT_VERSION"
 else