Add env variable to `Job` created by `JobSink` for the file path to the event

[Cali0707]

Problem With the current way that a Job is created in the JobSink, there is some logic that chooses which VolumeMount to use to mount the event. As such, the path that the event is mounted at is not guaranteed to be the same for every Job created by a JobSink.

The JobSink should add an env variable K_EVENT_PATH into the container that points to the mount path of the volume which is chosen, making it easier to consume the event within the code of the job.

Here, we can inject the env variable before creating the job based on where the jobsink-event volume directory points to https://github.com/knative/eventing/blob/f9156c8874e40fdf8f11b53d11de09d2b7e51b0d/cmd/jobsink/main.go#L292-L299

Persona: Which persona is this feature for? Developers

Exit Criteria A measurable (binary) test that would indicate that the problem has been resolved.

Time Estimate (optional): How many developer-days do you think this may take to resolve? 1

[Cali0707]

cc @pierDipi - thoughts?

[Cali0707]

/good-first-issue

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[babugeet]

/assign

[babugeet]

@Cali0707 , @pierDipi I would like to work on this issue

[Cali0707]

Closing as #7968 is merged