Add split-slot A/B sample

[tomchy]

Add A/B sample variant, that describe multi-image FW through a MCUboot manifest with digests.

[NordicBuilder]

The following west manifest projects have changed revision in this Pull Request:

Name	Old Revision	New Revision	Diff

✅ All manifest checks OK

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[NordicBuilder]

CI Information

^{To view the history of this post, clich the 'edited' button above}
Build number: 3

Inputs:

Sources:

more details

Github labels

Enabled	Name	Description
	ci-disabled	Disable the ci execution
	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

List of changed files detected by CI (0)

Outputs:

Toolchain

Version:
Build docker image:

Test Spec & Results: ✅ Success; ❌ Failure; 🟠 Queued; 🟡 Progress; ◻️ Skipped; ⚠️ Quarantine

• ❌ Toolchain
• ❌ Build twister
• ❌ Integration tests

Note: This message is automatically posted and updated by the CI

[NordicBuilder]

Memory footprint analysis revealed the following potential issues

applications.hpf.gpio.icmsg[nrf54l15dk/nrf54l15/cpuflpr]: High RAM usage: 9102[B] - link (cc: @nrfconnect/ncs-ll-ursus)
applications.hpf.gpio.icmsg[nrf54l15dk/nrf54l15/cpuflpr]: High ROM usage: 5858[B] - link (cc: @nrfconnect/ncs-ll-ursus)
applications.hpf.gpio.icbmsg[nrf54l15dk/nrf54l15/cpuflpr]: High RAM usage: 12744[B] - link (cc: @nrfconnect/ncs-ll-ursus)
applications.hpf.gpio.icbmsg[nrf54l15dk/nrf54l15/cpuflpr]: High ROM usage: 9492[B] - link (cc: @nrfconnect/ncs-ll-ursus)

Note: This message is automatically posted and updated by the CI (latest/sdk-nrf/PR-25036/2)