feat(install): add --lockfile-only flag (#31376)

Adds a `--lockfile-only` flag that only updates the lockfile and doesn't
install any npm deps locally. Note that jsr and https dependencies are
still cached because they require looking at the code to resolve
dependencies.

Applies to `deno install`, `deno add`, `deno remove`, `deno outdated
--update`, and `deno update`

Closes #31371

Author: dsherret

Cargo.lock

@@ -71,7 +71,7 @@ deno_lint = "=0.82.0"
 deno_lockfile = "=0.32.2"
 deno_media_type = { version = "=0.3.0", features = ["module_specifier"] }
 deno_native_certs = "0.3.0"
-deno_npm = "=0.42.0"
+deno_npm = "=0.42.1"
 deno_path_util = "=0.6.4"
 deno_semver = "=0.9.1"
 deno_task_shell = "=0.26.0"