Fix path & rehersal job type check in some methods & improve related unit tests

[sg-rh]

No description provided.

[etirta]

I've seen several pattern are repeated, branching and settings. This is maintenance burden.

A much better approach is to branch 1x and store the deviating data once.

Say at line 49:

        if self.is_rehearsal:
            try:
                self.pr_id = pr_id or os.getenv("PULL_NUMBER") or self.name.split("-")[1]  # type: ignore
            except IndexError:
                self.logger.warning(
                    f"Pull number for job {self.name} not obtained, reporting may not be complete.",
                )
                self.pr_id = "1"
            self.logger.info(f"PR ID: {self.pr_id}")
            self.blobPfx = "pr-logs/pull/openshift_release/{self.pr_id}"
        else:
            self.pr_id = ""
            self.blobPfx = "logs"

Then we can safe us a lot of branches throughout the code and if any change on the path is only 1 place modification.

Another observation, not really related to this PR, why a lot of function parameters, such as job_name is marked with Optional[...] hint, while it's clearly inside the function code it can' handle None type? This is not good practice.