TV: configurable retries allowed before disabling broadcast

Currently the onFailureClosure will allow 3 failures to happen (soon to include instant fail #123). This should be more configurable based on the severity of the failure, or the type of failure. All failures are currently treated the same, and will increment the failure counter.

It is proposed to have a severity argument which may have a higher weighting when incrementing the counter, or fail immediately.

Start by locating the onFailureClosure mentioned in the issue and review how its three-failure limit currently works. Check issue #123 for the proposed instant-fail behavior. The work is complete when failures can be handled according to a defined severity or type policy rather than all incrementing the counter identically.

Written by the indexing model from the issue text.