Move `outcome_names` from `BenchmarkRunner` to `BenchmarkTestFunction`

[esantorella]

Summary: Context: This will enable constructing the BenchmarkRunner based on the BenchmarkProblem and BenchmarkMethod rather than asking the user to provide it. In addition to making things simpler (it's weird that a runner is part of a problem!), that will enable the Runner to be aware of aspects of the method, such as parallelism.

This will also enable us to return metrics in a dict format ({outcome_name: value}) if we choose to do so in the future. That may be simpler since the data already gets processed into dicts by the runner.

Note that for problems based on BoTorch problems, names are usually already set programmatically, so that logic moves to the test problem.

This diff:

• Requires outcome_names on BenchmarkTestFunction
• Removes outcome_names as an argument from BenchmarkRunner
• Sets outcome names automatically on BoTorchTestFunction when they are not provided, following the convention used elsewhere.

Update usages:

• Remove outcome_names from calls to BenchmarkRunner
• Add outcome_names to calls to BenchmarkTestFunction, where needed; they are generally already present on surroagate test functions and can be constructed automatically for BoTorch-based problems.

Differential Revision: D65497700

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This pull request was exported from Phabricator. Differential Revision: D65497700

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.61%. Comparing base (8231273) to head (68473c1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3021 +/- ## ======================================= Coverage 95.60% 95.61% ======================================= Files 483 483 Lines 49012 49046 +34 ======================================= + Hits 46859 46893 +34 Misses 2153 2153 ```

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This pull request was exported from Phabricator. Differential Revision: D65497700

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D65497700

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D65497700

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D65497700

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This pull request has been merged in facebook/Ax@ffedab0ccb7c1be53e3e04ba9acbb0fad96a56be.