[MM-53086] Remove SendWelcomePost A/B test and feature (#23733)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/storetest/mocks/UserStore.go

@@ -635,30 +635,6 @@ func (_m *UserStore) GetEtagForProfilesNotInTeam(teamID string) string {
 	return r0
 }
 
-// GetFirstSystemAdminID provides a mock function with given fields:
-func (_m *UserStore) GetFirstSystemAdminID() (string, error) {
-	ret := _m.Called()
-
-	var r0 string
-	var r1 error
-	if rf, ok := ret.Get(0).(func() (string, error)); ok {
-		return rf()
-	}
-	if rf, ok := ret.Get(0).(func() string); ok {
-		r0 = rf()
-	} else {
-		r0 = ret.Get(0).(string)
-	}
-
-	if rf, ok := ret.Get(1).(func() error); ok {
-		r1 = rf()
-	} else {
-		r1 = ret.Error(1)
-	}
-
-	return r0, r1
-}
-
 // GetForLogin provides a mock function with given fields: loginID, allowSignInWithUsername, allowSignInWithEmail
 func (_m *UserStore) GetForLogin(loginID string, allowSignInWithUsername bool, allowSignInWithEmail bool) (*model.User, error) {
 	ret := _m.Called(loginID, allowSignInWithUsername, allowSignInWithEmail)

server/channels/store/storetest/user_store.go

@@ -94,7 +94,6 @@ func TestUserStore(t *testing.T, ss store.Store, s SqlStore) {
 	t.Run("ResetLastPictureUpdate", func(t *testing.T) { testUserStoreResetLastPictureUpdate(t, ss) })
 	t.Run("GetKnownUsers", func(t *testing.T) { testGetKnownUsers(t, ss) })
 	t.Run("GetUsersWithInvalidEmails", func(t *testing.T) { testGetUsersWithInvalidEmails(t, ss) })
-	t.Run("GetFirstSystemAdminID", func(t *testing.T) { testUserStoreGetFirstSystemAdminID(t, ss) })
 }
 
 func testUserStoreSave(t *testing.T, ss store.Store) {
@@ -4194,30 +4193,6 @@ func testCount(t *testing.T, ss store.Store) {
 	}
 }
 
-func testUserStoreGetFirstSystemAdminID(t *testing.T, ss store.Store) {
-	sysAdmin := &model.User{}
-	sysAdmin.Email = MakeEmail()
-	sysAdmin.Roles = model.SystemAdminRoleId + " " + model.SystemUserRoleId
-	sysAdmin, err := ss.User().Save(sysAdmin)
-	require.NoError(t, err)
-	defer func() { require.NoError(t, ss.User().PermanentDelete(sysAdmin.Id)) }()
-
-	// We need the second system admin to be created after the first one
-	// our granulirity is ms
-	time.Sleep(1 * time.Millisecond)
-
-	sysAdmin2 := &model.User{}
-	sysAdmin2.Email = MakeEmail()
-	sysAdmin2.Roles = model.SystemAdminRoleId + " " + model.SystemUserRoleId
-	sysAdmin2, err = ss.User().Save(sysAdmin2)
-	require.NoError(t, err)
-	defer func() { require.NoError(t, ss.User().PermanentDelete(sysAdmin2.Id)) }()
-
-	returnedId, err := ss.User().GetFirstSystemAdminID()
-	require.NoError(t, err)
-	require.Equal(t, sysAdmin.Id, returnedId)
-}
-
 func testUserStoreAnalyticsActiveCount(t *testing.T, ss store.Store, s SqlStore) {
 
 	cleanupStatusStore(t, s)