Refactor/core qol adoption (#17655)

* Scripts: close every msg_info block with msg_ok

Past-tense msg_info calls that should have been msg_ok, notices that opened a block before a prompt, and blocks without a closing msg_ok. These already left a stale spinner; with core's block stack they would resume it after every later msg_ok.

* Generate passwords with random_password

openssl rand -base64 | tr -dc | head -c returned fewer characters than asked for, and the unfiltered | cut variants put / and + into passwords that end up in DSNs and sed expressions. Secrets an app decodes as base64 are unchanged. Requires community-scripts/core#61.

* Keep data directories through CLEAN_INSTALL instead of copying them

create_backup copied uploads, storage and similar directories twice per update and needed their size again in free space. CLEAN_INSTALL_KEEP moves them aside instead. Only directories the upstream release does not ship, in scripts that restored right after the fetch. Requires community-scripts/core#61.

* Drop the 300s uv timeout overrides

setup_uv exports UV_HTTP_TIMEOUT=600 now; the scripts' 300 only lowered it. Requires community-scripts/core#61.

install/discourse-install.sh

@@ -33,7 +33,7 @@ NODE_VERSION="24" setup_nodejs
 RUBY_VERSION="3.4.4" setup_ruby
 
 msg_info "Configuring PostgreSQL for Discourse"
-DISCOURSE_DB_PASS=$(openssl rand -base64 18 | tr -dc 'a-zA-Z0-9' | head -c13)
+DISCOURSE_DB_PASS=$(random_password 13)
 PG_HBA=$(find /etc/postgresql -name pg_hba.conf 2>/dev/null | head -n1)
 sed -i 's/^local\s\+all\s\+all\s\+peer$/local   all             all                                     md5/' "$PG_HBA"
 $STD systemctl restart postgresql
@@ -97,7 +97,7 @@ $STD bundle exec rails db:seed
 msg_ok "Set Up Database"
 
 msg_info "Creating Admin Account"
-ADMIN_PASS=$(openssl rand -base64 18 | tr -dc 'a-zA-Z0-9' | head -c16)
+ADMIN_PASS=$(random_password 16)
 $STD bundle exec rails runner "
 user = User.new(email: 'admin@discourse.local', username: 'admin', password: '${ADMIN_PASS}')
 user.active = true