Benchmark ci fixes

[ryanio]

This PR:

• Runs git stash before github-action-benchmark
• Runs benchmarks on PRs
• Updates the root package-lock.json

[codecov]

Codecov Report

Merging #840 into master will decrease coverage by 1.42%.
The diff coverage is n/a.

Flag	Coverage Δ
#account	92.85% <ø> (ø)
#block	77.81% <ø> (?)
#blockchain	81.33% <ø> (+0.30%)	⬆️
#common	94.14% <ø> (+0.15%)	⬆️
#ethash	83.33% <ø> (+1.11%)	⬆️
#tx	94.16% <ø> (ø)
#vm	92.49% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[holgerd77]

Not sure about this, feel free to update, but have given this a WIP label since benchmarks CI is showed as "failing".

[ryanio]

@holgerd77 thanks! @evertonfraga's commit was the fix needed, just had to also apply it to vm-pr.yml (in addition to vm-build.yml) so this should be ready for review and merge now! I also rebased on master.

Sorry about the performance alerts, I'm hoping once this is running on master we'll get some normalization of the benchmark run times. If it's all over the place then I'll have to re-think the approach.

[evertonfraga]

I wish I could make the stash command simpler, but my tries led to syntax errors for the yaml parser. Maybe next iteration! :)

[holgerd77]

@evertonfraga nice work, thanks! 🙂