Upgrade Go to 1.24.3 (#31220)

* Upgrade Go to 1.24.3

Updates the following files:
- server/.go-version: 1.23.9 → 1.24.3
- server/build/Dockerfile.buildenv: golang:1.23.9-bullseye → golang:1.24.3-bullseye
- server/go.mod: go 1.23.0 → go 1.24.3, toolchain go1.23.9 → go1.24.3
- server/public/go.mod: go 1.23.0 → go 1.24.3, toolchain go1.23.9 → go1.24.3

Also fixes non-constant format string errors introduced by Go 1.24.3's stricter format string checking:
- Added response() helper function in slashcommands/util.go for simple string responses
- Removed unused responsef() function from slashcommands/util.go
- Replaced responsef() with response() for translated strings that don't need formatting
- Fixed fmt.Errorf and fmt.Fprintf calls to use proper format verbs instead of string concatenation
- Updated marketplace buildURL to handle format strings conditionally

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update generated mocks for Go 1.24.3

Regenerated mocks using mockery v2.53.4 to ensure compatibility with Go 1.24.3.
This addresses mock generation failures that occurred with the Go upgrade.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Update to bookworm and fix non-existent sha

Signed-off-by: Stavros Foteinopoulos <stafot@gmail.com>

* fix non-constant format string

---------

Signed-off-by: Stavros Foteinopoulos <stafot@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Stavros Foteinopoulos <stafot@gmail.com>

server/platform/services/searchengine/mocks/SearchEngineInterface.go

@@ -1,4 +1,4 @@
-// Code generated by mockery v2.42.2. DO NOT EDIT.
+// Code generated by mockery v2.53.4. DO NOT EDIT.
 
 // Regenerate this file using `make searchengine-mocks`.
 
@@ -217,7 +217,7 @@ func (_m *SearchEngineInterface) DeleteUserPosts(rctx request.CTX, userID string
 	return r0
 }
 
-// GetFullVersion provides a mock function with given fields:
+// GetFullVersion provides a mock function with no fields
 func (_m *SearchEngineInterface) GetFullVersion() string {
 	ret := _m.Called()
 
@@ -235,7 +235,7 @@ func (_m *SearchEngineInterface) GetFullVersion() string {
 	return r0
 }
 
-// GetName provides a mock function with given fields:
+// GetName provides a mock function with no fields
 func (_m *SearchEngineInterface) GetName() string {
 	ret := _m.Called()
 
@@ -253,7 +253,7 @@ func (_m *SearchEngineInterface) GetName() string {
 	return r0
 }
 
-// GetPlugins provides a mock function with given fields:
+// GetPlugins provides a mock function with no fields
 func (_m *SearchEngineInterface) GetPlugins() []string {
 	ret := _m.Called()
 
@@ -273,7 +273,7 @@ func (_m *SearchEngineInterface) GetPlugins() []string {
 	return r0
 }
 
-// GetVersion provides a mock function with given fields:
+// GetVersion provides a mock function with no fields
 func (_m *SearchEngineInterface) GetVersion() int {
 	ret := _m.Called()
 
@@ -371,7 +371,7 @@ func (_m *SearchEngineInterface) IndexUser(rctx request.CTX, user *model.User, t
 	return r0
 }
 
-// IsActive provides a mock function with given fields:
+// IsActive provides a mock function with no fields
 func (_m *SearchEngineInterface) IsActive() bool {
 	ret := _m.Called()
 
@@ -389,7 +389,7 @@ func (_m *SearchEngineInterface) IsActive() bool {
 	return r0
 }
 
-// IsAutocompletionEnabled provides a mock function with given fields:
+// IsAutocompletionEnabled provides a mock function with no fields
 func (_m *SearchEngineInterface) IsAutocompletionEnabled() bool {
 	ret := _m.Called()
 
@@ -407,7 +407,7 @@ func (_m *SearchEngineInterface) IsAutocompletionEnabled() bool {
 	return r0
 }
 
-// IsEnabled provides a mock function with given fields:
+// IsEnabled provides a mock function with no fields
 func (_m *SearchEngineInterface) IsEnabled() bool {
 	ret := _m.Called()
 
@@ -425,7 +425,7 @@ func (_m *SearchEngineInterface) IsEnabled() bool {
 	return r0
 }
 
-// IsIndexingEnabled provides a mock function with given fields:
+// IsIndexingEnabled provides a mock function with no fields
 func (_m *SearchEngineInterface) IsIndexingEnabled() bool {
 	ret := _m.Called()
 
@@ -443,7 +443,7 @@ func (_m *SearchEngineInterface) IsIndexingEnabled() bool {
 	return r0
 }
 
-// IsIndexingSync provides a mock function with given fields:
+// IsIndexingSync provides a mock function with no fields
 func (_m *SearchEngineInterface) IsIndexingSync() bool {
 	ret := _m.Called()
 
@@ -461,7 +461,7 @@ func (_m *SearchEngineInterface) IsIndexingSync() bool {
 	return r0
 }
 
-// IsSearchEnabled provides a mock function with given fields:
+// IsSearchEnabled provides a mock function with no fields
 func (_m *SearchEngineInterface) IsSearchEnabled() bool {
 	ret := _m.Called()
 
@@ -717,7 +717,7 @@ func (_m *SearchEngineInterface) SearchUsersInTeam(teamId string, restrictedToCh
 	return r0, r1
 }
 
-// Start provides a mock function with given fields:
+// Start provides a mock function with no fields
 func (_m *SearchEngineInterface) Start() *model.AppError {
 	ret := _m.Called()
 
@@ -737,7 +737,7 @@ func (_m *SearchEngineInterface) Start() *model.AppError {
 	return r0
 }
 
-// Stop provides a mock function with given fields:
+// Stop provides a mock function with no fields
 func (_m *SearchEngineInterface) Stop() *model.AppError {
 	ret := _m.Called()