Low: various: address format-overflow warnings

When using -O3 to build pacemaker, gcc (14) will throw format-overflow
warnings for some possibly null '%s' directive arguments. We address the
current instances of such warnings by either removing meaningless log
entries or by moving them into proper contexts.

alerts.c:153:19: error: '%s' directive argument is null [-Werror=format-overflow=]
153 | crm_trace("Inserting alert key %s = '%s'", *key, value);

|                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

alerts.c:153:46: note: format string is defined here
153 | crm_trace("Inserting alert key %s = '%s'", *key, value);

|

Signed-off-by: Athos Ribeiro <athos.ribeiro@canonical.com>