feat(core): Change workflow deletions to soft deletes (#14894)

Adds soft‑deletion support for workflows through a new boolean column `isArchived`.

When a workflow is archived we now set `isArchived` flag to true and the workflows
stays in the database and is omitted from the default workflow listing query.

Archived workflows can be viewed in read-only mode, but they cannot be activated.

Archived workflows are still available by ID and can be invoked as sub-executions,
so existing Execute Workflow nodes continue to work. Execution engine doesn't
care about isArchived flag.

Users can restore workflows via Unarchive action at the UI.

packages/workflow/test/TelemetryHelpers.test.ts

@@ -94,6 +94,7 @@ describe('generateNodesGraph', () => {
 			id: 'NfV4GV9aQTifSLc2',
 			name: 'My workflow 26',
 			active: false,
+			isArchived: false,
 			nodes: [
 				{
 					parameters: {},
@@ -157,6 +158,7 @@ describe('generateNodesGraph', () => {
 			id: 'NfV4GV9aQTifSLc2',
 			name: 'My workflow 26',
 			active: false,
+			isArchived: false,
 			nodes: [],
 			connections: {},
 			settings: { executionOrder: 'v1' },
@@ -198,6 +200,7 @@ describe('generateNodesGraph', () => {
 			id: 'NfV4GV9aQTifSLc2',
 			name: 'My workflow 26',
 			active: false,
+			isArchived: false,
 			nodes: [
 				{
 					parameters: {},
@@ -263,6 +266,7 @@ describe('generateNodesGraph', () => {
 			id: 'NfV4GV9aQTifSLc2',
 			name: 'My workflow 26',
 			active: false,
+			isArchived: false,
 			nodes: [
 				{
 					parameters: {},
@@ -339,6 +343,7 @@ describe('generateNodesGraph', () => {
 			id: 'NfV4GV9aQTifSLc2',
 			name: 'My workflow 26',
 			active: false,
+			isArchived: false,
 			nodes: [
 				{
 					parameters: {},