[MM-44488] Cloud limits: enforcing messages (#20362)

* Add new Job to keep updating the last_accessible_post time

* Filter out posts for funcs returning PostList model

* Separate methods to get and compute cache

* filter pinned posts

* For posts with sorted CreateAt order, support a faster form of filtering.

* Add inaccessible header for getPost and getPostsByIDs APIs

* replace manual binary search with the std. library

* in-place filter posts

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Nathaniel Allred <neallred@protonmail.com>

app/server.go

@@ -49,6 +49,7 @@ import (
 	"github.com/mattermost/mattermost-server/v6/jobs/extract_content"
 	"github.com/mattermost/mattermost-server/v6/jobs/import_delete"
 	"github.com/mattermost/mattermost-server/v6/jobs/import_process"
+	"github.com/mattermost/mattermost-server/v6/jobs/last_accessible_post"
 	"github.com/mattermost/mattermost-server/v6/jobs/migrations"
 	"github.com/mattermost/mattermost-server/v6/jobs/product_notices"
 	"github.com/mattermost/mattermost-server/v6/jobs/resend_invitation_email"
@@ -2046,6 +2047,12 @@ func (s *Server) initJobs() {
 		extract_content.MakeWorker(s.Jobs, New(ServerConnector(s.Channels())), s.Store),
 		nil,
 	)
+
+	s.Jobs.RegisterJobType(
+		model.JobTypeLastAccessiblePost,
+		last_accessible_post.MakeWorker(s.Jobs, s.License(), New(ServerConnector(s.Channels()))),
+		last_accessible_post.MakeScheduler(s.Jobs, s.License()),
+	)
 }
 
 func (s *Server) TelemetryId() string {