fix(cloudflared): remove chart default pdb maxunavailable & minavailable

[MuriukiPM]

Kubito Helm Charts PR Checklist

Thank you for your contribution! Please ensure the following:

• Chart Version: Updated version in Chart.yaml for the relevant chart.

• README Update: If values.yaml was changed, run:

  readme-generator -v charts/your-chart/values.yaml -r charts/your-chart/README.md

  I was unable to install this tool, but I have updated the readme manually.

• Testing: Tested the chart locally, and it works as expected.

Changes Summary

We shouldn't set both maxunavailable & minavailable, they are mutually exclusive and will result in an error from kubernetes minAvailable and maxUnavailable cannot be both set.
Instead, we leave the default value file with null values, and let the user to set their values if they enable the pdb
e.g

cloudflared:
  podDisruptionBudget:
    enabled: true
    minAvailable: 2

Related Issues

N/A