studio: handle revision errors when posting

[dberenbaum]

Context: I found this when testing out a treeverse/dvclive#464 in a repo with overlapping outputs (tracking the model as both a stage output and in a .dvc file).

Before this PR:

$ dvc exp run -f
DVC failed to load some parameters for following revisions: ''.
DVC failed to load some metrics for following revisions: ''.
ERROR: Failed to reproduce experiment '9dc4c70': 'data'

After this PR:

$ dvc exp run -f
DVC failed to load some parameters for following revisions: ''.
DVC failed to load some metrics for following revisions: ''.
ERROR: output 'model' is already specified in stages:
        - train
        - model.dvc

This still isn't a good UX, but at least now I can see a somewhat more useful error.

[dberenbaum]

Related: #8986

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (0bd34c8) 92.91% compared to head (d474ec0) 92.91%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9137   +/-   ##
=======================================
  Coverage   92.91%   92.91%           
=======================================
  Files         456      456           
  Lines       36821    36824    +3     
  Branches     5313     5314    +1     
=======================================
+ Hits        34212    34215    +3     
  Misses       2085     2085           
  Partials      524      524           

Impacted Files	Coverage Δ
dvc/repo/experiments/utils.py	82.28% <100.00%> (ø)
tests/unit/repo/experiments/test_utils.py	100.00% <100.00%> (ø)

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