Profiling: fix stack version to profiling version alignment (#4367)

Only for stack version 8.8 the v3 host agent version should be used. Starting with stack version 8.9, the host agent version is aligned to the stack version.

(cherry picked from commit aa0301c)

docs/en/observability/profiling-get-started.asciidoc

@@ -142,4 +142,4 @@ https://container-library.elastic.co/r/observability/profiling-agent[Elastic con
 * For {k8s} deployments, the Helm chart version is already used to configure the same container image, unless
 overwritten with the `version` parameter in the Helm values file.
 
-* For {stack} version 8.8 or higher, use `v3` host agents. For version 8.7, use `v2`. `v3` host agents are incompatible with 8.7 {stack} versions.
+* For {stack} version 8.8, use `v3` host agents. For version 8.7, use `v2`. `v3` host agents are incompatible with 8.7 {stack} versions.