refactor(helm): Unified Naming Truncation and Bug Fixes (#8143)

* refactor(helm): add componentName helper for truncation

* fix(helm): unify ingress backend naming with truncation

* fix(helm): unify statefulset/deployment naming with truncation

* fix(helm): add missing labels to services for servicemonitor discovery

* chore(helm): secure secrets and add upgrade notes

* fix(helm): truncate context instead of suffix in componentName

* revert(docs): remove upgrade notes per feedback

* fix(helm): use componentName for COSI serviceAccountName

* helm: update master -ip to use component name for correct truncation

* helm: refactor masterServers helper to use truncated component names

* helm: update volume -ip to use component name and cleanup redundant printf

* helm: refine helpers with robustness check and updated docs

k8s/charts/seaweedfs/templates/s3/s3-secret.yaml

@@ -1,6 +1,11 @@
 {{- if or (and (or .Values.s3.enabled .Values.allInOne.enabled) .Values.s3.enableAuth (not .Values.s3.existingConfigSecret)) (and .Values.filer.s3.enabled .Values.filer.s3.enableAuth (not .Values.filer.s3.existingConfigSecret)) }}
 {{- $secretName := printf "%s-s3-secret" (include "seaweedfs.fullname" .) }}
-{{- $existingSecret := lookup "v1" "Secret" .Release.Namespace (default $secretName .Values.s3.legacySecretName) }}
+{{- $legacySecretName := "seaweedfs-s3-secret" }}
+{{- $lookupName := $secretName }}
+{{- if .Values.s3.reuseLegacySecret }}
+{{-   $lookupName = default $legacySecretName .Values.s3.legacySecretName }}
+{{- end }}
+{{- $existingSecret := lookup "v1" "Secret" .Release.Namespace $lookupName }}
 {{- $reuse := false }}
 {{- if and .Values.s3.reuseLegacySecret $existingSecret }}
 {{- $reuse = true }}