Migrate from Gecko SDK 4.4.4 to Simplicity SDK 2024.6.2

[puddly]

I think most of the issues have been ironed out in the 2024.6.2 release of the Simplicity SDK.

This PR upgrades OpenThread, Zigbee, and the Gecko Bootloader templates.

[Nerivec]

Some extra stuff for create_gbl.py (also the file for cpc_version changed):
main...Nerivec:silabs-firmware-builder:improved-versions-retrieval

Produces a cleaner output with ot_version than current ot_rcp_version in my opinion (better filenames, no need for processing in yaml):

{"baudrate":460800,"fw_type":"openthread_rcp","fw_variant":"no_flow","metadata_version":2,"ot_rcp_version":"SL-OPENTHREAD/2.5.2.0_GitHub-1fceb225b","sdk_version":"2024.6.2"}

{"baudrate":460800,"fw_type":"openthread_rcp","fw_variant":"no_flow","metadata_version":2,"ot_version":"2.5.2.0","sdk_version":"2024.6.2"}

Also more in line with ezsp_version meta:

{"baudrate":115200,"ezsp_version":"8.0.2.0","fw_type":"zigbee_ncp","fw_variant":"sw_flow","metadata_version":2,"sdk_version":"2024.6.2"}

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Some actions in build.yaml are outdated.
#87

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Worth mentioning, some configs require to be set through slcp_defines to actually be applied:

slcp_defines:
  SL_ZIGBEE_ADDRESS_TABLE_SIZE: 32
  SL_ZIGBEE_MULTICAST_TABLE_SIZE: 26
  SL_ZIGBEE_ROUTE_TABLE_SIZE: 16
  SL_ZIGBEE_DISCOVERY_TABLE_SIZE: 8

FIY - SDK defaults:

ADDRESS_TABLE_SIZE = 8
MULTICAST_TABLE_SIZE = 8
ROUTE_TABLE_SIZE = 16
DISCOVERY_TABLE_SIZE = 8

[puddly]

Regarding the OpenThread version: the commit ID sometimes changes (and sometimes does not) even while the version stays static. I think this is also the version string returned by the Spinel protocol, in line with the others.