`esbuild` can work fine without needing to run post-install script, so
to make it easier on users (especially people using Vite) we are not prompting to run with
`--allow-scripts` again.
We only do that for version >= 0.18.0 to be sure.
Currently we only warn once. With this PR, we continue to warn about
not-run scripts on explicit `deno install` (or cache). For `run` (or
other subcommands) we only warn the once, as we do currently.
Refactors the lifecycle scripts code to extract out the common
functionality and then uses that to provide a warning in the global
resolver.
While ideally we would still support them with the global cache, for now
a warning is at least better than the status quo (where people are
unaware why their packages aren't working).
