applications: Migrate to the new board variant

[tomchy]

Use nRF52840 dongle board variant for applications that overwrite nRF5 SDK bootloader.

Ref: NCSDK-33774

[github-actions]

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

Name	Old Revision	New Revision	Diff
mcuboot	nrfconnect/sdk-mcuboot@1b1a37f	nrfconnect/sdk-mcuboot#469	nrfconnect/sdk-mcuboot#469/files
zephyr	nrfconnect/sdk-zephyr@476ad66	nrfconnect/sdk-zephyr#3007	nrfconnect/sdk-zephyr#3007/files

⛔ DNM label due to: 2 projects with PR revision

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: 1

Inputs:

Sources:

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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)

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Toolchain

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Build docker image:

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

• ❌ Toolchain
• ❌ Build twister
• ❌ Integration tests

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[github-actions]

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[tomchy]

Decided to go with the implementation similar to: #23055