ci: parallelize tests where possible

[faddat]

• parallel tests
• paralleltest

Description

Closes: #XXXX

This PR extends the linting of tests, and adds parallelization by
adding paralleltest to .golangci.yml

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• included the necessary unit and integration tests
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• manually tested (if applicable)

[julienrbrt]

Wow, thanks for that. You can skip e2e tests btw as we are going to completely refactor them.

Tests using testify suite can as well be skipped (stretchr/testify#187)

[tac0turtle]

Lets pice meal this across a few prs, I see the commits and worried about unforeseen issues

Some tests are already failing with data races, let's revert some of these and go package b package. it's easier to reason about the changes and easier to identify when something is causing issues. @faddat are you okay with that?

[faddat]

totally okay with that -- I was thinking the same thing approximately.

[faddat]

It started to look like this:

https://www.youtube.com/watch?v=tZqBrMqZLR4

[faddat]

Going to close this, and maybe reapproach module by module or such. Definitely began to cause unforeseen circumstances.