MM-24133: Migrate AppError from bot_store.go (#14339)

* MM-24135: Migrate AppError from SaveChannel/channel_store.go

This is the first POC of migration of store app errors to plain error.

We create a few basic error types in the store package and use
them to return the errors from store methods. In the app layer,
we inspect the error and re-create the exact app errors. This lets
us preserve the same error content, but yet move to plain errors.

Since this is a gradual migration, this means that the error inspection
code will be duplicated across the app layer whenever a store method
is invoked. But all of that should go away once we start propagating
the errors higher up the hierarchy.

There have been a significant amount of changes in the storetest and searchtest
layer, primarily because we have to rename the err variable now that it is of
a different type.

* Addressed review comments

* MM-24132: Migrate AppError from SaveDirectChannel/channel_store.go

This PR migrates 2 new methods SaveDirectChannel and CreateDirectChannel
to return error instead of AppError.

We also need to handle the error internally in SaveMultipleMember for now
until that is migrated too.

* MM-24133: Migrate AppError from bot_store.go

* Fix errors

* Fix err

* Fix bad return

* Fix vet errors

* Fix incorrect error check

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

app/user.go

@@ -7,6 +7,7 @@ import (
 	"bytes"
 	b64 "encoding/base64"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"hash/fnv"
 	"image"
@@ -1467,7 +1468,13 @@ func (a *App) PermanentDeleteUser(user *model.User) *model.AppError {
 	}
 
 	if err := a.Srv().Store.Bot().PermanentDelete(user.Id); err != nil {
-		return err
+		var invErr *store.ErrInvalidInput
+		switch {
+		case errors.As(err, &invErr):
+			return model.NewAppError("PermanentDeleteUser", "app.bot.permenent_delete.bad_id", map[string]interface{}{"user_id": invErr.Value}, invErr.Error(), http.StatusBadRequest)
+		default: // last fallback in case it doesn't map to an existing app error.
+			return model.NewAppError("PermanentDeleteUser", "app.bot.permanent_delete.internal_error", nil, err.Error(), http.StatusInternalServerError)
+		}
 	}
 
 	infos, err := a.Srv().Store.FileInfo().GetForUser(user.Id)