📖 book: update job documentation + add test-infra config

[sbueringer]

Signed-off-by: Stefan Büringer buringerst@vmware.com

What this PR does / why we need it:

• Updating the jobs.md with the current state (after #27621)
• Adding some info about our test-infra config to reduce the amount of tribal knowledge

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[sbueringer]

/hold
for the test-infra PR

[fabriziopandini]

That's great! Thank you for documenting all those details!
/lgtm

[killianmuldoon]

/lgtm

[sbueringer]

/approve
/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/approve
/cherry-pick release-1.2

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/hold cancel

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #7294

In response to this:

/approve
/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.