Refactor: Replace strings.Split with SplitList utility to handle empty inputs

[xnaveenx]

What this PR does / why we need it:
This PR refactors the usage of strings.Split across the codebase to use the stringutils.SplitList utility (27 files changed).

The Problem:
The standard strings.Split("", ",") returns a slice containing an empty string [""] (length 1). This causes logic errors in experiments where code checks len(slice) > 0 or iterates over the slice assuming it contains valid values, potentially leading to index out-of-range panics or invalid execution paths.

The Fix:
I have replaced strings.Split with stringutils.SplitList in user-input handling paths. This utility correctly returns an empty slice [] (length 0) when the input string is empty.

Changes Covered:

• Core Utils: pkg/utils/common/pods.go, pkg/utils/common/nodes.go
• Status Checks: pkg/status/nodes.go, pkg/status/application.go
• Cloud Helpers: Updated status and helper files for AWS, Azure, GCP, and VMware in pkg/cloud/*.
• Chaos Libraries: Updated corresponding libraries in chaoslib/ (e.g., Disk Loss, Instance Stop, Node Drain).
• AWS Experiment: Fixed the entry point in experiments/kube-aws/ec2-terminate-by-id.

Which issue this PR fixes : fixes #788

Special notes for your reviewer:

• Validated that go build ./... passes successfully across the entire project to ensure no dependencies were broken.
• Verified that go test -v github.com/litmuschaos/litmus-go/pkg/utils/stringutils passes.
• Note: I intentionally excluded chaoslib/litmus/network-chaos/helper/netem.go from this refactor as it contains custom parsing logic (whitelisting with !) that requires strings.Split behavior.

Checklist:

• Fixes Refactor: Replace inline string splitting with robust SplitList utility #788
• PR messages has document related information
• Labelled this PR & related issue with breaking-changes tag
• PR messages has breaking changes related information
• Labelled this PR & related issue with requires-upgrade tag
• PR messages has upgrade related information
• Commit has unit tests
• Commit has integration tests
• E2E run Required for the changes