fix(cronjob): handle undefined spec.suspend in List and Details

[Athang69]

Summary

This PR fixes a crash in the CronJob list and details pages when spec.suspend is not explicitly set in the CronJob manifest. Kubernetes defaults spec.suspend to false but does not always include it in the API response, causing .toString() to be called on undefined and throwing a TypeError

Related Issue

Fixes #5083

Changes

• Fixed frontend/src/components/cronjob/List.tsx added ?? false fallback before .toString() on spec.suspend in the Suspend column getValue
• Fixed frontend/src/components/cronjob/Details.tsx added ?. optional chaining on spec and ?? false fallback for isCronSuspended derivation
• Fixed frontend/src/components/cronjob/Details.tsx added ?? false fallback before .toString() on spec.suspend in the extraInfo Suspend field

Steps to Test

1. Apply a CronJob manifest that omits spec.suspend e.g. a Helm generated CronJob
2. Navigate to Workloads -> CronJobs
3. Verify the list renders correctly and shows false in the Suspend column without crashing
4. Click on the CronJob to open its details page
5. Verify the details page renders correctly and shows false for the Suspend field
6. Repeat with a CronJob that has spec.suspend:true explicitly set and verify it still shows true correctly

Notes for the Reviewer

spec.suspend is defined as optional in the Kubernetes batch/v1 CronJobSpec its absence from the API response is valid behaviour, not a bug in the cluster
The ?? false fallback exactly matches the Kubernetes-defined default for this field, so there is no behaviour change for CronJobs that have the field explicitly set
The additional ?. on spec in isCronSuspended guards against the loading phase before the API response arrives, which the original cronJob?.spec.suspend did not cover

[k8s-ci-robot]

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