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.sum

@@ -509,6 +509,8 @@ github.com/mattermost/ldap v0.0.0-20201202150706-ee0e6284187d h1:/RJ/UV7M5c7L2TQ
 github.com/mattermost/ldap v0.0.0-20201202150706-ee0e6284187d/go.mod h1:HLbgMEI5K131jpxGazJ97AxfPDt31osq36YS1oxFQPQ=
 github.com/mattermost/logr/v2 v2.0.16 h1:jnePX4cPskC3WDFvUardh/xZfxNdsFXbEERJQ1kUEDE=
 github.com/mattermost/logr/v2 v2.0.16/go.mod h1:1dm/YhTpozsqANXxo5Pi5zYLBsal2xY0pX+JZNbzYJY=
+github.com/mattermost/mattermost/server/public v0.0.6 h1:FUaJ+P36E3Tt12Umdm8p1h7sZNUeObDk3p3aFTaBkCo=
+github.com/mattermost/mattermost/server/public v0.0.6/go.mod h1:Y7Ht1haGGrsuYzX73HhpSe2VnbGLuZj2/tsQslHd2/M=
 github.com/mattermost/morph v1.0.5-0.20230511171014-e76e25978d56 h1:SjFYbWvmuf73d/KaYlnHosPpB3/k38ebr1WWw9X5XKc=
 github.com/mattermost/morph v1.0.5-0.20230511171014-e76e25978d56/go.mod h1:gD+EaqX2UMyyuzmF4PFh4r33XneQ8Nzi+0E8nXjMa3A=
 github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0 h1:G9tL6JXRBMzjuD1kkBtcnd42kUiT6QDwxfFYu7adM6o=