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.

ct/fluid-calendar.sh

@@ -37,7 +37,7 @@ function update_script() {
   if check_for_gh_release "fluid-calendar" "dotnetfactory/fluid-calendar"; then
     msg_info "Stopping Service"
     systemctl stop fluid-calendar
-    msg_info "Stopped Service"
+    msg_ok "Stopped Service"
 
     create_backup /opt/fluid-calendar/.env
     CLEAN_INSTALL=1 fetch_and_deploy_gh_release "fluid-calendar" "dotnetfactory/fluid-calendar" "tarball"