Feature/irnas zephyr template migration

[NejcKle]

Description

This PR implements changes required to migrate the workflow files and scripts from the irnas-runners-software repository to this one and irnas-workflows-software. Some files got moved around and/or to different repositories, see Related below.

Changes:

• Workflow files have been modified to run on self-hosted runners.
• The makefile has been modified to include the remote twister runner task.
• Relevant scripts related to remote Raspberry Pi twister runner have been included.
• Docs have been updated.

Closes #

Related https://github.com/IRNAS/irnas-runners-software/pull/6 https://github.com/IRNAS/irnas-workflows-software/pull/9

Areas of interest for the reviewer

Check the workflow files and docs.

Checklist

• [x] My code follows the [style guidelines] as defined by IRNAS.
• [x] I have performed a self-review of my code.
• [x] My changes generate no new warnings.
• [x] I added/updated source code documentation for all newly added or changed functions.
• [x] I updated all customer-facing technical documentation.

After-review steps

• Reviewer can merge and delete the branch.

[style guidelines]: https://github.com/IRNAS/irnas-guidelines-docs/blob/main/docs/developer_guidelines.md