ci(golangci-lint): update configuration and fix lint issues (#4247)

* ci: update golangci-lint configuration and lint settings

- Update golangci-lint to version 2
- Enable new linters and adjust existing ones
- Update lint settings across multiple test files
- Remove unused struct and variable checks
- Add new lint exclusions for generated code and specific directories

Signed-off-by: Flc <four_leaf_clover@foxmail.com>

* ci(github): update golangci-lint-action to v8 and lint version to v2.3.4

Signed-off-by: Flc <four_leaf_clover@foxmail.com>

* ci: downgrade golangci-lint to v2.1.6

Signed-off-by: Flc <four_leaf_clover@foxmail.com>

* ci(golangci): add gofumpt linter and fix related issues- Added gofumpt linter to .golangci.yml

Signed-off-by: Flc <four_leaf_clover@foxmail.com>

* test: ignore testifylint and gofumpt lints in specific test cases

Signed-off-by: Flc <four_leaf_clover@foxmail.com>

* build(deps): remove golang.org/x/lint

- Remove golang.org/x/lint package from go.mod
- Update related dependencies in go.sum

Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

* build(deps): downgrade golang.org/x/mod and golang.org/x/tools

- Downgrade golang.org/x/mod from v0.24.0 to v0.18.0
- Downgrade golang.org/x/tools from v0.33.0 to v.22.0

These changes are made to address compatibility issues with the current project setup.

Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

---------

Signed-off-by: Flc <four_leaf_clover@foxmail.com>
Signed-off-by: flc1125 <four_leaf_clover@foxmail.com>

githubapi_test.go

@@ -298,8 +298,8 @@ func TestShouldBindUri(t *testing.T) {
 	router.Handle(http.MethodGet, "/rest/:name/:id", func(c *Context) {
 		var person Person
 		require.NoError(t, c.ShouldBindUri(&person))
-		assert.NotEqual(t, "", person.Name)
-		assert.NotEqual(t, "", person.ID)
+		assert.NotEmpty(t, person.Name)
+		assert.NotEmpty(t, person.ID)
 		c.String(http.StatusOK, "ShouldBindUri test OK")
 	})
 
@@ -320,8 +320,8 @@ func TestBindUri(t *testing.T) {
 	router.Handle(http.MethodGet, "/rest/:name/:id", func(c *Context) {
 		var person Person
 		require.NoError(t, c.BindUri(&person))
-		assert.NotEqual(t, "", person.Name)
-		assert.NotEqual(t, "", person.ID)
+		assert.NotEmpty(t, person.Name)
+		assert.NotEmpty(t, person.ID)
 		c.String(http.StatusOK, "BindUri test OK")
 	})