[testbed] Allow setting path of child process Collector executable #23258
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Description:
A refactor that unexported the struct unintentionally made it so the executable path could not be set. This keeps the struct unexported, but adds an option to allow setting the path. I'm open to making the struct public again if that's preferred, this just seemed like the most straightforward method.
I also made
agentExePath
private to make it clear it's not meant to be accessed outside the package.Testing:
A unit test was added to verify the change.
Documentation:
Godoc was added to the option function.