tools/pve: source telemetry and core helpers from the core repo

Thirty scripts still pulled misc/api.func out of this repo, and three of
them misc/core.func, while update-apps.sh had already moved to the
community-scripts/core layout. Point the rest at the same place so the
directory stops being split across two sources.

misc/api.func is the monolithic predecessor of what core now ships split
into api/api.func and api/telemetry.func; both define init_tool_telemetry.
core/core.func carries every function misc/core.func has except
parse_dev_mode, which moved to core/dev-mode.func and is used by no
script here.

misc/api.func stays: vm/*.sh, misc/vm-core.func and turnkey.sh still
source it.

tools/pve/microcode.sh

@@ -30,7 +30,8 @@ msg_ok() { echo -e "${BFR} ${CM} ${GN}$1${CL}"; }
 msg_error() { echo -e "${BFR} ${CROSS} ${RD}$1${CL}"; }
 
 # Telemetry
-source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/api.func) 2>/dev/null || true
+_CS_CORE_URL="${COMMUNITY_SCRIPTS_CORE_URL:-https://raw.githubusercontent.com/community-scripts/core/main}"
+source <(curl -fsSL "${_CS_CORE_URL}/api/api.func") 2>/dev/null || true
 declare -f init_tool_telemetry &>/dev/null && init_tool_telemetry "microcode" "pve"
 
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