Add retries and confirmations to ensure CNCF runners and machines are removed.

[gyohuangxin]

Description

There are some remaining CNCF runners not being remove after tests done, the number of them gradually increases over time.
We can delete them manually, but it's better to make sure they are properly removed.

The same thing happened to equinix servers deletion：

Expected Behavior

We should add retries and confirmations to ensure CNCF runners and machines are removed.

Screenshots/Logs

Environment:

• Meshery Version:
• Kubernetes Version:
• Host OS:
• Browser:

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue is being automatically closed due to inactivity. However, you may choose to reopen this issue.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue is being automatically closed due to inactivity. However, you may choose to reopen this issue.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.