Re-use scratch orgs by CI/CD

[kryvyifedir]

CI/CD shouldn't create new scratch org for each modification of the PR. Instead it should create an org and re-use it if possible.
Org can be named using PR number, and found by this command:
(Note, JQ is needed)
- name: List all orgs
run: |
sf org list --json --all --skip-connection-status | jq . > sfOrgList.json
cat sfOrgList.json
jq ".result.scratchOrgs | .[] | select(.alias == "build_${{ github.event.pull_request.number }}")'" sfOrgList.json > scratch.json
cat scratch.json