Modify the content format of the Feishu webhook (#25106)

close https://github.com/go-gitea/gitea/issues/24368

## what my pull request does

Since the official documentation states that custom bots do not support
hyperlink functionality, simply adding it without making some formatting
changes would result in an unappealing output. Therefore, I have
modified the formatting of the output. Currently, it is only used for
Feishu.

--- 


[docs](https://open.feishu.cn/document/uAjLw4CM/ukTMukTMukTM/im-v1/message/create_json#%E8%B6%85%E9%93%BE%E6%8E%A5%E4%BD%BF%E7%94%A8%E8%AF%B4%E6%98%8E)

<img width="641" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/360e1c81-ab64-4ef6-851e-aa450d6e85a4">

- Issue

<img width="423" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/519f6fae-81ab-4ec8-89b8-f6a73ff93783">


- Issue Comment


<img width="548" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/749c0d1c-3657-431e-b787-8bf4c23cce83">


- Assign

<img width="431" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/066f99e5-eabb-455d-91fb-a8359cc26dc7">

<img width="457" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/c6c10f99-db83-46ef-a775-4c91979fa68f">

- Merge

<img width="408" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/e627bf43-5954-45aa-acf6-261ee046802f">

- PullRequest

<img width="425" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/72cfa714-d3fa-4fb9-abdd-e8508d756056">

services/webhook/feishu_test.go

@@ -72,7 +72,7 @@ func TestFeishuPayload(t *testing.T) {
 		require.NotNil(t, pl)
 		require.IsType(t, &FeishuPayload{}, pl)
 
-		assert.Equal(t, "#2 crash\r\n[test/repo] Issue opened: #2 crash by user1\r\n\r\nissue body", pl.(*FeishuPayload).Content.Text)
+		assert.Equal(t, "[Issue-test/repo #2]: opened\ncrash\nhttp://localhost:3000/test/repo/issues/2\nIssue by user1\nOperator: user1\nAssignees: user1\n\nissue body", pl.(*FeishuPayload).Content.Text)
 
 		p.Action = api.HookIssueClosed
 		pl, err = d.Issue(p)
@@ -80,7 +80,7 @@ func TestFeishuPayload(t *testing.T) {
 		require.NotNil(t, pl)
 		require.IsType(t, &FeishuPayload{}, pl)
 
-		assert.Equal(t, "#2 crash\r\n[test/repo] Issue closed: #2 crash by user1", pl.(*FeishuPayload).Content.Text)
+		assert.Equal(t, "[Issue-test/repo #2]: closed\ncrash\nhttp://localhost:3000/test/repo/issues/2\nIssue by user1\nOperator: user1\nAssignees: user1\n\nissue body", pl.(*FeishuPayload).Content.Text)
 	})
 
 	t.Run("IssueComment", func(t *testing.T) {
@@ -92,7 +92,7 @@ func TestFeishuPayload(t *testing.T) {
 		require.NotNil(t, pl)
 		require.IsType(t, &FeishuPayload{}, pl)
 
-		assert.Equal(t, "#2 crash\r\n[test/repo] New comment on issue #2 crash by user1\r\n\r\nmore info needed", pl.(*FeishuPayload).Content.Text)
+		assert.Equal(t, "[Comment-test/repo #2]: created\ncrash\nhttp://localhost:3000/test/repo/issues/2\nIssue by user1\nOperator: user1\n\nmore info needed", pl.(*FeishuPayload).Content.Text)
 	})
 
 	t.Run("PullRequest", func(t *testing.T) {
@@ -104,7 +104,7 @@ func TestFeishuPayload(t *testing.T) {
 		require.NotNil(t, pl)
 		require.IsType(t, &FeishuPayload{}, pl)
 
-		assert.Equal(t, "#12 Fix bug\r\n[test/repo] Pull request opened: #12 Fix bug by user1\r\n\r\nfixes bug #2", pl.(*FeishuPayload).Content.Text)
+		assert.Equal(t, "[PullRequest-test/repo #12]: opened\nFix bug\nhttp://localhost:3000/test/repo/pulls/12\nPullRequest by user1\nOperator: user1\nAssignees: user1\n\nfixes bug #2", pl.(*FeishuPayload).Content.Text)
 	})
 
 	t.Run("PullRequestComment", func(t *testing.T) {
@@ -116,7 +116,7 @@ func TestFeishuPayload(t *testing.T) {
 		require.NotNil(t, pl)
 		require.IsType(t, &FeishuPayload{}, pl)
 
-		assert.Equal(t, "#12 Fix bug\r\n[test/repo] New comment on pull request #12 Fix bug by user1\r\n\r\nchanges requested", pl.(*FeishuPayload).Content.Text)
+		assert.Equal(t, "[Comment-test/repo #12]: created\nFix bug\nhttp://localhost:3000/test/repo/pulls/12\nPullRequest by user1\nOperator: user1\n\nchanges requested", pl.(*FeishuPayload).Content.Text)
 	})
 
 	t.Run("Review", func(t *testing.T) {