Consolidate golangci-lint enabled linters in the config

[matej-g]

It seems that we are currently enabling all linters in our config, however it seems not all of them are useful to us, for example:

• There are plenty of nolint:gochecknoglobals and nolint:gochecknoinits directives, although we are aware of the reasons we're using global / init() for particular source files in our code base
• exhaustivestruct seems to be also only recommended for special cases, but we're enabling it without (I think) a good reason

The ideal outcome of resolving the issue: We have understanding of which linters cause more noise than add value and these linters are disabled