Support explicitly specifying which CLI binaries to invoke

[negz]

The e2e-framework offers packages to help spin up Kind clusters and install Helm charts. These packages wrap the kind and helm CLI tools. (There may be other wrapped CLI tools but I haven't encountered them yet.)

The framework seems to look for these tools with hardcoded binary names (kind, helm) in $PATH. If kind isn't available the framework attempts to install it using go install. If helm isn't available the framework returns an error.

In @crossplane our Makefile handles installation of tools like Kind and Helm, but it doesn't install them in $PATH. We can probably hack around this when running the E2E tests (e.g. add a dir to $PATH and symlink to the tools from that dir) but it would be ideal to be able to pass the path to the binaries as flags.

[negz]

As a side note, it would also be useful to debug log which binaries are being used.

[harshanarayana]

/reopen

[k8s-ci-robot]

@harshanarayana: Reopened this issue.

In response to this:

/reopen

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[harshanarayana]

I missed taking care of a few items on the previous PR. Need to update a few more bits and then this can be closed.