Add documentation for struct fields

[nirs]

Problem

Many struct fields throughout the codebase lack documentation comments. This makes it harder for developers to understand the purpose and usage of fields, especially in public APIs and report structures.

Examples

• pkg/report/application.go: Fields like ClusterTime, SchedulingInterval, LastGroupSyncTime in DRPCSummary and VRGSummary
• pkg/report/clusters.go: Various fields in summary structs

Proposal

Add godoc comments for all exported struct fields, following Go documentation conventions:

type DRPCSummary struct {
    Name               string               `json:"name"`
    Namespace          string               `json:"namespace"`
    // ClusterTime is the API server time when the DRPC was gathered
    ClusterTime        *time.Time           `json:"clusterTime,omitempty"`
    // SchedulingInterval is the replication scheduling interval from the DRPolicy
    SchedulingInterval ValidatedDuration    `json:"schedulingInterval"`
    // LastGroupSyncTime is the timestamp of the last successful volume synchronization
    LastGroupSyncTime  ValidatedTime        `json:"lastGroupSyncTime"`
    // ... other fields
}

Benefits

• Improved code readability
• Better IDE autocomplete and hover documentation
• Clearer API contracts
• Easier onboarding for new contributors

[Dhanalakshmi-D04]

Hey @nirs , Can I take up this issue?