Pass context when executing command in the agent container.

[pablochacin]

Description

Faults are injected in pods by executing a command in the xk6-agent's ephemeral container.

As described in #82 any ongoing command to the xk6-disruptor is not canceled if the test is canceled. In #109 we introduced the logic to get the context of the VU that creates a disruptor. This context is canceled if the VU is canceled.

In this PR, we pass the VU's context when executing the command in the pod and using the feature introduced in k8s go client v1.25.0 we are using this context when establishing a connection to the pod. This changes should get the ongoing command canceled if the VU is canceled.

Checklist:

• My code follows the coding style of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• Any dependent changes have been merged and published in downstream modules
  

[pablochacin]

This logic is implemented as part of #279