conformance testing: switch to pytest + cwltest

[mr-c]

1. Usethe cwltest plugin for pytest
2. Simplify the Singularity install
3. Simplify the release test (saved 17 minutes for that run)

All together this speeds up the entire GitHub Actions CI run.

Previously the overall wall time was 29 minutes 22 seconds

Now 14 minutes 43 seconds

Specific speed ups:

• CWL v1.2 with Docker & --fast-parser from ~17 minutes to ~6.5 minutes

[codecov]

Codecov Report

Merging #1783 (d797ad4) into main (955616b) will increase coverage by 0.67%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1783      +/-   ##
==========================================
+ Coverage   82.51%   83.19%   +0.67%     
==========================================
  Files          47       44       -3     
  Lines        8209     8130      -79     
  Branches     2237     2224      -13     
==========================================
- Hits         6774     6764      -10     
+ Misses        941      874      -67     
+ Partials      494      492       -2     

Impacted Files	Coverage Δ
cwltool/main.py	73.98% <0.00%> (-1.84%)	⬇️
cwltool.py
cwltool/run_job.py
gittaggers.py
cwltool/singularity.py	70.56% <0.00%> (+4.76%)	⬆️

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