feat: add Killercoda scenario for Workload Affinity and Anti-Affinity scheduling (v1.17)

[Ram04102007]

What this PR does

Adds a new interactive Killercoda scenario for the Workload Affinity
and Anti-Affinity Scheduling feature introduced in Karmada v1.17.

Why

The playground currently has 4 scenarios but none covering the new
WorkloadAffinity feature shipped in v1.17 (March 2026). This fills
that gap and aligns with the LFX Mentorship 2026 Term 1 goal of
adding tutorials for current Karmada features.

Scenario structure

• Step 1: Verify the multi-cluster environment
• Step 2: Deploy workloads with Affinity (co-location)
• Step 3: Deploy workloads with Anti-Affinity (spreading)
• Step 4: Inspect ResourceBinding scheduling decisions

Closes karmada-io/karmada#7498

[karmada-bot]

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[karmada-bot]

Welcome @Ram04102007! It looks like this is your first PR to karmada-io/playground 🎉

[gemini-code-assist]

Code Review

This pull request introduces a new Killercoda interactive scenario focused on Workload Affinity and Anti-Affinity scheduling in Karmada v1.17. The scenario includes a background setup script, four instructional steps with verification scripts, and a final summary. Feedback was provided regarding the background setup script, specifically recommending the removal of error masking during the scheduler rollout and increasing the timeout to ensure the environment is correctly initialized before the user begins the tutorial.

[Ram04102007]

Hi @RainbowMango @jwcesign — gentle ping on this PR.
Happy to make any changes if needed. Thanks for your time!