fix(argo-workflows): revert BASE_HREF change (#2770)

* fix(argo-workflows): revert `BASE_HREF` change

This reverts commit 134cecde5812612514995205cd8fcc6a7f933373.

Sorry, I screwed up this and caused a regression. Didn't read my own release notes (from 4 months ago to be fair) where `ARGO_BASE_HREF` would not work previously as it was inconsistently `ARGO_BASEHREF`. So there is no forward compatible change to be made here, so just revert this.

Will have to reinstate this change for the 3.6 upgrade

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

* changelog update

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

---------

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

charts/argo-workflows/templates/server/server-deployment.yaml

@@ -95,7 +95,7 @@ spec:
                 fieldRef:
                   apiVersion: v1
                   fieldPath: metadata.namespace
-            - name: ARGO_BASE_HREF
+            - name: BASE_HREF
               value: {{ .Values.server.baseHref | quote }}
           {{- with .Values.server.extraEnv }}
             {{- toYaml . | nindent 12 }}