feat(yurt-iot-dock): add --skip-preflight-checks flag to bypass prefl…

[amuammer]

What type of PR is this?

/kind feature
/sig iot

What this PR does / why we need it:

Adds a new --skip-preflight-checks flag to yurt-iot-dock that allows
bypassing the preflight namespace validation check on startup.

In some edge deployment scenarios (restricted RBAC, bootstrapping, or
environments where the namespace exists but is temporarily unreachable),
the preflight check fails and causes the controller to exit immediately,
even when the rest of the system is functional.

This flag gives operators the flexibility to skip the check when needed.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

The flag defaults to false, so existing behavior is completely unchanged.
Only when --skip-preflight-checks=true is explicitly passed will the
preflight check be skipped.

Changes:

• cmd/yurt-iot-dock/app/options/options.go: Added SkipPreflightChecks bool field and registered the flag
• cmd/yurt-iot-dock/app/core.go: Guarded the preflight block with the new flag

Does this PR introduce a user-facing change?

Added `--skip-preflight-checks` flag to yurt-iot-dock. When set to `true`, 
the preflight namespace validation check is skipped on startup. Defaults to `false`.

Exmaple

yurt-iot-dock --nodepool=edge-pool --skip-preflight-checks=true

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud