refactor: remove osext dependency

What does this MR do?

Remove osext.

Why was this MR needed?

As of go 1.8+ Executable is part of the std lib and osext is deprecated ( see https://github.com/kardianos/osext/issues/20 and https://github.com/kubernetes/kubernetes/issues/80127 )

What's the best way to test this MR?

What are the relevant issue numbers?

Could potentially fix #1246 (closed)

@feistel

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added Community contribution label

@gitlab-bot label grouprunner

added grouprunner label

added 1st contribution label

Setting label(s) Category:Runner devopsverify sectionops based on grouprunner.

added [Deprecated] Category:Runner devopsverify sectionops labels

mentioned in issue gitlab-org/quality/triage-reports#4349 (closed)

mentioned in issue gitlab-com/www-gitlab-com#12305 (closed)

mentioned in issue gitlab-org/quality/triage-reports#4539 (closed)

added 107 commits

• 0285d448...72d757b6 - 106 commits from branch gitlab-org:main
• c80453e0 - refactor: remove osext dependency

Compare with previous version

@ajwalker I figure you have a lot of context in this area.

requested review from @ajwalker

mentioned in issue gitlab-org/quality/triage-reports#4700 (closed)

added maintenancerefactor label

changed milestone to %14.4

approved this merge request

Thanks for this @feistel. I was not aware of this and it's always good to be able to remove unnecessary dependencies!

Adding to merge train

pipeline failed. I've rebased on main

started a merge train

removed this merge request from the merge train because pipeline did not succeed