[WIP] Fix variable interpolation in disable-all-workflows.sh

[Copilot]

• Update all variable references to use braces consistently (${var} instead of $var)
  • Line 11: ${#} for argument count
  • Line 12: ${0} for script name
  • Line 16: ${1} for first argument
  • Line 17: ${2} for second argument
  • Line 28: "${OWNER}"/"${REPO}" in API path
  • Line 32: "${active_ids}" in conditional check
  • Line 33: ${OWNER}/${REPO} in echo message
  • Line 37: ${active_ids} in for loop
  • Line 41: "${OWNER}"/"${REPO}"/actions/workflows/"${id}" in API path
  • Line 46: ${OWNER}/${REPO} in final echo message
• Validate changes with shellcheck (passes with no errors)
• Test the script functionality (no test scripts available)

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