EDM-3284: "root" stays the default user for applications

[celdrake]

After some discussions, the Backend won't make flightctl the default user for the runAs field.

So we must treat unset "runAs" values as "root", though we want to promote the user choosing "flightctl" by default when creating new applicatoins, and having the UI explicitly setting the value even when it's the default (root).

Summary by CodeRabbit

• Updates
  • Clarified messaging: changed wording to present a recommended user identity rather than a "default" label.
  • Unified user-identity behavior across the app: run-as handling now consistently favors an explicit root recommendation where appropriate.
  • UI text and help copy updated to better guide configuration of application user identities and integrity settings.

[coderabbitai]

Walkthrough

Replace the single RUN_AS_DEFAULT_USER constant with two explicit constants (RUN_AS_ROOT_USER and RUN_AS_FLIGHTCTL_USER), update code paths and UI components to use the new constants, and rename one localization key from "By default, workloads run as..." to "The recommended user identity is...".

Changes

Cohort / File(s)	Summary
Type definition libs/ui-components/src/types/deviceSpec.ts	Removed RUN_AS_DEFAULT_USER; added RUN_AS_ROOT_USER = 'root' and RUN_AS_FLIGHTCTL_USER = 'flightctl' (with comment about root being the system default).
Device spec utilities libs/ui-components/src/components/Device/EditDeviceWizard/deviceSpecUtils.ts	Replaced usages of RUN_AS_DEFAULT_USER with RUN_AS_ROOT_USER/RUN_AS_FLIGHTCTL_USER; added hasRunAsChanged and getRunAsUser helpers; updated form ↔ API conversion paths to apply new defaulting rules.
Edit device UI libs/ui-components/src/components/Device/EditDeviceWizard/steps/ApplicationIntegritySettings.tsx	Import switched to RUN_AS_FLIGHTCTL_USER and RUN_AS_ROOT_USER; system-integrity toggle, placeholder, and helper text now reference the new constants and "recommended" wording.
Applications table UI libs/ui-components/src/components/DetailsPage/Tables/ApplicationsTable.tsx	Changed default fallback for the "Run as user" column from RUN_AS_DEFAULT_USER to RUN_AS_ROOT_USER.
Localization libs/i18n/locales/en/translation.json	Renamed translation key from "By default, workloads run as the '{{ runAsUser }}' user..." to "The recommended user identity is '{{ runAsUser }}'..." (message text unchanged).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: ensuring 'root' remains the default user for applications, which is the core objective of this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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