drop public submodule replace directive (#24045)

* drop public submodule replace directive

During development of the public/ submodule, a replace directive remained that was both unnecessary and harmful as discussed in https://community.mattermost.com/private-core/pl/w77sh7igwpfb9ecj5o4jjjbbyo.

Remove that, and bump the explicit dependency (even though we use go.work) to v0.0.6 so the import paths match (e.g. `mattermost` vs `mattermost-server`).

* make modules-tidy

* consistently setup-go-work

* fix build-api-spec

* fix mmctl test template

* fix workflow copy/paste typo

server/go.mod

@@ -42,7 +42,7 @@ require (
 	github.com/mattermost/gziphandler v0.0.1
 	github.com/mattermost/ldap v0.0.0-20201202150706-ee0e6284187d
 	github.com/mattermost/logr/v2 v2.0.16
-	github.com/mattermost/mattermost/server/public v0.0.4
+	github.com/mattermost/mattermost/server/public v0.0.6
 	github.com/mattermost/morph v1.0.5-0.20230511171014-e76e25978d56
 	github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0
 	github.com/mattermost/squirrel v0.2.0
@@ -246,5 +246,3 @@ exclude (
 	github.com/dyatlov/go-opengraph v0.0.0-20210112100619-dae8665a5b09
 	github.com/willf/bitset v1.2.0
 )
-
-replace github.com/mattermost/mattermost/server/public => ./public