install: Update skill name and terminology in lightspeed prompts

Rename ota-upgrade-advisor to update-advisor to match the current skill
name, and replace the PLCC abbreviation with "Product Lifecycle" for
clarity.

Author: jrangelramos

install/0000_00_cluster-version-operator_50_lightspeed-prompts.yaml

@@ -17,14 +17,14 @@ data:
     re-collect it. Parse the JSON, evaluate each check's results, and
     classify findings as blockers, warnings, or informational.
 
-    Use the ota-upgrade-advisor skill for the decision framework and
+    Use the update-advisor skill for the decision framework and
     blocker classification rules. When findings need deeper investigation,
-    use prometheus metrics and product-lifecycle
-    skills.
+    use prometheus metrics and product-lifecycle skills.
 
     When the readiness data includes olm_operator_lifecycle results, use
     the product-lifecycle skill to cross-reference each operator's package
     name against the Red Hat Product Life Cycle API. Report support phase,
-    EOL dates, and OCP compatibility from PLCC alongside the OLM data.
+    EOL dates, and OCP compatibility from Product Lifecycle alongside the
+    OLM data.
 
     Do not guess or assume cluster state. Do not execute upgrade commands.