Add more linters to improve code readability (#19989)

Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)

routers/api/v1/activitypub/reqsignature.go

@@ -41,7 +41,7 @@ func getPublicKeyFromResponse(b []byte, keyID *url.URL) (p crypto.PublicKey, err
 		return
 	}
 	p, err = x509.ParsePKIXPublicKey(block.Bytes)
-	return
+	return p, err
 }
 
 func fetch(iri *url.URL) (b []byte, err error) {
@@ -59,7 +59,7 @@ func fetch(iri *url.URL) (b []byte, err error) {
 		return
 	}
 	b, err = io.ReadAll(io.LimitReader(resp.Body, setting.Federation.MaxSize))
-	return
+	return b, err
 }
 
 func verifyHTTPSignatures(ctx *gitea_context.APIContext) (authenticated bool, err error) {
@@ -87,7 +87,7 @@ func verifyHTTPSignatures(ctx *gitea_context.APIContext) (authenticated bool, er
 	// 3. Verify the other actor's key
 	algo := httpsig.Algorithm(setting.Federation.Algorithms[0])
 	authenticated = v.Verify(pubKey, algo) == nil
-	return
+	return authenticated, err
 }
 
 // ReqHTTPSignature function

routers/api/v1/notify/notifications.go

@@ -63,5 +63,5 @@ func subjectToSource(value []string) (result []models.NotificationSource) {
 			result = append(result, models.NotificationSourceRepository)
 		}
 	}
-	return
+	return result
 }

routers/api/v1/org/org.go

@@ -47,7 +47,7 @@ func listUserOrgs(ctx *context.APIContext, u *user_model.User) {
 	}
 
 	ctx.SetLinkHeader(int(maxResults), listOptions.PageSize)
-	ctx.SetTotalCountHeader(int64(maxResults))
+	ctx.SetTotalCountHeader(maxResults)
 	ctx.JSON(http.StatusOK, &apiOrgs)
 }
 

routers/api/v1/repo/file.go

@@ -251,7 +251,7 @@ func getBlobForEntry(ctx *context.APIContext) (blob *git.Blob, lastModified time
 	}
 	blob = entry.Blob()
 
-	return
+	return blob, lastModified
 }
 
 // GetArchive get archive of a repository

routers/api/v1/repo/issue_label.go

@@ -321,5 +321,5 @@ func prepareForReplaceOrAdd(ctx *context.APIContext, form api.IssueLabelsOption)
 		return
 	}
 
-	return
+	return issue, labels, err
 }

routers/api/v1/repo/status.go

@@ -57,7 +57,7 @@ func NewCommitStatus(ctx *context.APIContext) {
 		return
 	}
 	status := &git_model.CommitStatus{
-		State:       api.CommitStatusState(form.State),
+		State:       form.State,
 		TargetURL:   form.TargetURL,
 		Description: form.Description,
 		Context:     form.Context,

routers/api/v1/utils/hook.go

@@ -133,7 +133,7 @@ func addHook(ctx *context.APIContext, form *api.CreateHookOption, orgID, repoID
 			BranchFilter: form.BranchFilter,
 		},
 		IsActive: form.Active,
-		Type:     webhook.HookType(form.Type),
+		Type:     form.Type,
 	}
 	if w.Type == webhook.SLACK {
 		channel, ok := form.Config["channel"]