test: Allow test harness to execute benchmarks

[AndrewSisley]

Relevant issue(s)

Resolves #2739

Description

Allows test harness to execute benchmark tests as well as normal-tests.

Broken out of #2545 - is a good change independent of that though anyway and will allow us to use the integration test actions in benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.06%. Comparing base (6573d8c) to head (5b64707).

❗ Current head 5b64707 differs from pull request most recent head 91f125b

Please upload reports for the commit 91f125b to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2740      +/-   ##
===========================================
- Coverage    78.09%   78.06%   -0.03%     
===========================================
  Files          311      310       -1     
  Lines        23235    23185      -50     
===========================================
- Hits         18144    18098      -46     
+ Misses        3707     3702       -5     
- Partials      1384     1385       +1     

Flag	Coverage Δ
all-tests	78.06% <ø> (-0.03%)	⬇️

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see 14 files with indirect coverage changes

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[fredcarle]

LGTM. Looking forward to see how you intend to use this change.