Update deployment bypass mechanism to use named variables

[AlexSkrypnyk]

In deploy.sh:

# Allow skipping deployment by providing `$VORTEX_DEPLOY_SKIP_PR_<NUMBER>`
# variable with value set to "1", where `<NUMBER>` is a PR number name with
# spaces, hyphens and forward slashes replaced with underscores and then
# capitalised.
#

This requires modifying GHA config because it does not allow to pass all variables to the step (it requires to explicitly map vars to the environment variables).

This mechanism needs to be updated to use $VORTEX_DEPLOY_SKIP_PRS and $VORTEX_DEPLOY_SKIP_BRANCHES and use a comma-separated list within a value.