[feature] Implement reports admin API so admins can view + close reports (#1378)

* add admin report api endpoints + tests

* [chore] remove funky duplicate attachment in testrig

internal/processing/admin/getreport.go

@@ -0,0 +1,45 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
+
+   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 admin
+
+import (
+	"context"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) ReportGet(ctx context.Context, account *gtsmodel.Account, id string) (*apimodel.AdminReport, gtserror.WithCode) {
+	report, err := p.db.GetReportByID(ctx, id)
+	if err != nil {
+		if err == db.ErrNoEntries {
+			return nil, gtserror.NewErrorNotFound(err)
+		}
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	apimodelReport, err := p.tc.ReportToAdminAPIReport(ctx, report, account)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return apimodelReport, nil
+}