[connectivity-tests] allow passing "tolerations" to cilium connectivity tests

[tchellomello]

Proposal / RFE

For environments in which nodes are taints, we don't have a transparent way to launch the connectivity tests.

Please introduce an option --tolerations {map} so tests and perf deployments can benefit from that.

Is your feature request related to a problem?

Sort of. On environments with nodes fully tainted, deployments must match and support tolerations to get scheduled.

Describe the solution you'd like

cilium connectivity test --tolerations {'operator': 'Exists'}