Update Ubuntu 24.04 to GA status

Fixes actions#10636

Update the `ubuntu-latest` label to use the Ubuntu-24.04 image and remove the `beta` tag.

* **README.md**
  - Remove the `beta` tag for Ubuntu 24.04 in the "Available Images" section.
  - Update the "Rollout Status of Latest Image Release" for Ubuntu 24.04 to reflect its GA status.
* **images/ubuntu/Ubuntu2404-Readme.md**
  - Update the "Installed Software" section to reflect the latest versions of pre-installed tools.
  - Add a note about the removal of the `beta` tag for Ubuntu 24.04.
* **images/ubuntu/templates/ubuntu-24.04.pkr.hcl**
  - Update the `image_version` variable to reflect the GA status of Ubuntu 24.04.
  - Ensure the `managed_image_name` variable is set to "ubuntu-24.04-ga".
* **images/ubuntu/toolsets/toolset-2404.json**
  - Update the list of pre-installed tools and versions to reflect the latest changes.
  - Add a note about the removal of the `beta` tag for Ubuntu 24.04.

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/actions/runner-images/issues/10636?shareId=XXXX-XXXX-XXXX-XXXX).

images/ubuntu/Ubuntu2404-Readme.md

@@ -315,3 +315,5 @@ Use the following command as a part of your job to start the service: 'sudo syst
 | zip                    | 3.0-13ubuntu0.1             |
 | zsync                  | 0.6.2-5build1               |
 
+### Note
+The `beta` tag for Ubuntu 24.04 has been removed.

images/ubuntu/templates/ubuntu-24.04.pkr.hcl

@@ -8,7 +8,7 @@ packer {
 }
 
 locals {
-  managed_image_name = var.managed_image_name != "" ? var.managed_image_name : "packer-${var.image_os}-${var.image_version}"
+  managed_image_name = var.managed_image_name != "" ? var.managed_image_name : "ubuntu-24.04-ga"
 }
 
 variable "allowed_inbound_ip_addresses" {
@@ -69,7 +69,7 @@ variable "image_os" {
 
 variable "image_version" {
   type    = string
-  default = "dev"
+  default = "GA"
 }
 
 variable "imagedata_file" {