finalization: step-*.sh: optionally skip repo upload

Teach the step-*.sh scripts to parse command line options. Add support
for --dry-run, which will skip the part where the CLs are uploaded:
useful for local experiments.

Bug: 323940469
Test: croot && build/tools/finalization/step-1.sh --dry-run # verify no CLs uploaded
Ignore-AOSP-first: VIC finalization happens outside AOSP
Change-Id: Ia58da02ae7a69c24f8332c90d1c779884e3a1dab

tools/finalization/command-line-options.sh

@@ -0,0 +1,8 @@
+ARGV=$(getopt --options '' --long dry-run -- "$@")
+eval set -- "$ARGV"
+while true; do
+    case "$1" in
+        --dry-run) repo_upload_dry_run_arg="--dry-run"; shift ;;
+        *) break
+    esac
+done