fix: support affinity for scan jobs

[maxbrunet]

Description

Allow setting pod affinity for node-collector and scan-jobs with the scanJob.affinity config option. If not set, the "Linux affinity" remains the default.

Closes #1835

Checklist

• I've read the guidelines for contributing to this repository.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[chen-keinan]

@maxbrunet please take a look at test fail

[chen-keinan]

@maxbrunet also run the following to update generated docs and static files:

mage generate:docs

mage generate:all

[chen-keinan]

@maxbrunet lgtm 🚀 thank you for the contribution