feat: add option to restrict seed job agent to only run builds that m…

[lavigneer]

…atch the node label

Fixes #1014

Changes

This change adds a new flag for telling the operator to spawn the seed jobs agent with the EXCLUSIVE mode set such that it will only run builds for jobs that match its label.

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[brokenpip3]

Thanks, seems valid and complete, will take a look later this week :)

Also I'm switching the PR to ready-for-review so we can run the e2e tests in the mean time

[brokenpip3]

we are trying to merge #1037 this first so we can update the base that will used to make changes like this one ^

[brokenpip3]

we can finally review this PR 🎉

are you able to add a test for this? it could be a bats or ginko ones, you choose, the important part is to cover this specific case with and without seedJobRestrictJobsToLabel

thanks