VM keys in Goca Template are not up to date for OS Vector

[jaypif]

Description
Based on the documentation page: https://docs.opennebula.io/6.10/management_and_operations/references/template.html?highlight=firmware#os-and-boot-options-section
The OSVec struct in the Goca are not accurate.
Firmware values are missing

Here is the current state in the one/src/oca/go/src/goca/schemas/vm/keys/template.go file:

type OS string

	OSVec string = "OS"

	Arch       OS = "ARCH"
	Machine    OS = "MACHINE"
	Kernel     OS = "KERNEL"
	KernelDS   OS = "KERNEL_DS"
	Initrd     OS = "INITRD"
	InitrdDS   OS = "INITRD_DS"
	Root       OS = "ROOT"
	KernelCmd  OS = "KERNEL_CMD"
	Bootloader OS = "BOOTLOADER"
	Boot       OS = "BOOT"
)```

**Use case**
This is required by recent OS with UEFI boot for example.


**Interface Changes**
no change, just align the OSVec structure with the documentation

**Additional Context**
Terraform provider can be updated to reflect automatically changes in Goca.

<!--////////////////////////////////////////////-->
<!-- THIS SECTION IS FOR THE DEVELOPMENT TEAM   -->
<!-- BOTH FOR BUGS AND ENHANCEMENT REQUESTS     -->
<!-- PROGRESS WILL BE REFLECTED HERE            -->
<!--////////////////////////////////////////////-->

## Progress Status
- [ ] Code committed
- [ ] Testing - QA
- [ ] Documentation (Release notes - resolved issues, compatibility, known issues)