chore: rename agent-helper to coder-helper (#816)

## Description

Change `agent-helper` to `coder-utils`

The current tag for agent-helper needs to be deleted before this PR is
merged.

## Type of Change

- [x] New module - kinda..
- [ ] New template
- [ ] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [x] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/coder/modules/coder-utils`  
**New version:** `v1.0.0`  
**Breaking change:** [X] Yes [ ] No ( Module name is changing, but this
is not nested in any modules yet )

## Testing & Validation

- [x] Tests pass (`bun test`)
- [x] Code formatted (`bun fmt`)
- [x] Changes tested locally

## Related 

https://github.com/coder/registry/pull/802

registry/coder/modules/coder-utils/README.md

@@ -1,25 +1,25 @@
 ---
-display_name: Agent Helper
+display_name: Coder Utils
 description: Building block for modules that need orchestrated script execution
 icon: ../../../../.icons/coder.svg
 verified: false
 tags: [internal, library]
 ---
 
-# Agent Helper
+# Coder Utils
 
 > [!CAUTION]
 > We do not recommend using this module directly. It is intended primarily for internal use by Coder to create modules with orchestrated script execution.
 
-The Agent Helper module is a building block for modules that need to run multiple scripts in a specific order. It uses `coder exp sync` for dependency management and is designed for orchestrating pre-install, install, post-install, and start scripts.
+The Coder Utils module is a building block for modules that need to run multiple scripts in a specific order. It uses `coder exp sync` for dependency management and is designed for orchestrating pre-install, install, post-install, and start scripts.
 
 > [!NOTE]
 >
 > - The `agent_name` should be the same as that of the agentapi module's `agent_name` if used together.
 
 ```tf
-module "agent_helper" {
+module "coder_helper" {
-  source  = "registry.coder.com/coder/agent-helper/coder"
+  source  = "registry.coder.com/coder/coder-utils/coder"
   version = "1.0.0"
 
   agent_id        = coder_agent.main.id

registry/coder/modules/coder-utils/main.test.ts

@@ -1,7 +1,7 @@
 import { describe } from "bun:test";
 import { runTerraformInit, testRequiredVariables } from "~test";
 
-describe("agent-helper", async () => {
+describe("coder-utils", async () => {
   await runTerraformInit(import.meta.dir);
 
   testRequiredVariables(import.meta.dir, {

registry/coder/modules/coder-utils/main.tftest.hcl

@@ -1,4 +1,4 @@
-# Test for agent-helper module
+# Test for coder-utils module
 
 # Test with all scripts provided
 run "test_with_all_scripts" {