USDT probes are missing on master

[jpsamaroo]

The task runtime USDT probes were effectively removed in #44653; these should be re-added to the appropriate places in the new pure-Julia PARTR runtime to prevent breakage for users who might be relying on them since 1.8.

@vtjnash @vchuravy

[gbaraldi]

@jpsamaroo I don't think we are going to be able to reintroduce the probepoints as was discussed in the profiling meeting for 1.9. Do you think we could remove this from the milestone?