[2.4.x Backport] Gracefully handle old pipelines where output commit is ALIAS and metacommit is AUTO (#8485)

[acohen4]

Gracefully handle old pipelines where output commit is ALIAS and meta commit is AUTO

[codecov]

Codecov Report

Merging #8493 (199d14f) into 2.4.x (68170a4) will decrease coverage by 0.05%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##            2.4.x    #8493      +/-   ##
==========================================
- Coverage   38.84%   38.79%   -0.06%     
==========================================
  Files         425      425              
  Lines      117552   117556       +4     
==========================================
- Hits        45666    45601      -65     
- Misses      62769    62809      +40     
- Partials     9117     9146      +29     

Impacted Files	Coverage Δ
...rc/server/worker/pipeline/transform/pending_job.go	67.26% <60.00%> (-0.26%)	⬇️
src/internal/miscutil/work_deduper.go	90.00% <0.00%> (-10.00%)	⬇️
src/internal/storage/fileset/prefetcher.go	73.91% <0.00%> (-5.80%)	⬇️
src/server/auth/server/util.go	54.00% <0.00%> (-4.00%)	⬇️
src/internal/storage/chunk/uploader.go	86.20% <0.00%> (-3.45%)	⬇️
src/internal/storage/chunk/batcher.go	85.71% <0.00%> (-3.18%)	⬇️
src/internal/storage/chunk/client.go	53.37% <0.00%> (-2.71%)	⬇️
src/internal/stream/priority_queue.go	92.68% <0.00%> (-2.44%)	⬇️
src/internal/storage/chunk/transform.go	46.84% <0.00%> (-1.81%)	⬇️
src/server/pfs/server/val_server.go	55.35% <0.00%> (-1.79%)	⬇️
... and 20 more

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