[performance] update remaining worker pools to use queues (#2865)

* start replacing client + federator + media workers with new worker + queue types

* refactor federatingDB.Delete(), drop queued messages when deleting account / status

* move all queue purging to the processor workers

* undo toolchain updates

* code comments, ensure dereferencer worker pool gets started

* update gruf libraries in readme

* start the job scheduler separately to the worker pools

* reshuffle ordering or server.go + remove duplicate worker start / stop

* update go-list version

* fix vendoring

* move queue invalidation to before wipeing / deletion, to ensure queued work not dropped

* add logging to worker processing functions in testrig, don't start workers in unexpected places

* update go-structr to add (+then rely on) QueueCtx{} type

* ensure more worker pools get started properly in tests

* fix remaining broken tests relying on worker queue logic

* fix account test suite queue popping logic, ensure noop workers do not pull from queue

* move back accidentally shuffled account deletion order

* ensure error (non nil!!) gets passed in refactored federatingDB{}.Delete()

* silently drop deletes from accounts not permitted to

* don't warn log on forwarded deletes

* make if else clauses easier to parse

* use getFederatorMsg()

* improved code comment

* improved code comment re: requesting account delete checks

* remove boolean result from worker start / stop since false = already running or already stopped

* remove optional passed-in http.client

* remove worker starting from the admin CLI commands (we don't need to handle side-effects)

* update prune cli to start scheduler but not all of the workers

* fix rebase issues

* remove redundant return statements

* i'm sorry sir linter

internal/util/fns.go

@@ -0,0 +1,68 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package util
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+
+	"codeberg.org/gruf/go-errors/v2"
+)
+
+// Must executes 'fn' repeatedly until
+// it successfully returns without panic.
+func Must(fn func()) {
+	if fn == nil {
+		panic("nil func")
+	}
+	for !func() (done bool) {
+		defer func() {
+			if r := recover(); r != nil {
+				// Gather calling func frames.
+				pcs := make([]uintptr, 10)
+				n := runtime.Callers(3, pcs)
+				i := runtime.CallersFrames(pcs[:n])
+				c := gatherFrames(i, n)
+
+				const msg = "recovered panic: %v\n\n%s\n"
+				fmt.Fprintf(os.Stderr, msg, r, c.String())
+			}
+		}()
+		fn()
+		done = true
+		return
+	}() { //nolint
+	}
+}
+
+// gatherFrames collates runtime frames from a frame iterator.
+func gatherFrames(iter *runtime.Frames, n int) errors.Callers {
+	if iter == nil {
+		return nil
+	}
+	frames := make([]runtime.Frame, 0, n)
+	for {
+		f, ok := iter.Next()
+		if !ok {
+			break
+		}
+		frames = append(frames, f)
+	}
+	return frames
+}