[konflux] set a finalizer so that PLR perists

[ashwindasr]

Sometimes, during mass builds, a PipelineRun (PLR) might finish early but before our automation comes to check on it, it would have been pruned by konflux. Setting a finalizer will let us work around that.

But in order for us to be good citizens and don't put pressure on the etcd database by keeping a lot of PLRs around, we have to make sure to clean up after ourselves. Hence in addition to this, we would need a periodic job to remove our PLRs if the condition .metadata.deletionTimestamp != null and .metadata.deletionTimestamp - now() > 12h is satisfied.

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