Do not hardlink symlink assets

[perlpunk]

Issue: https://progress.opensuse.org/issues/129340

Hardlinking a symlink will only work if the link is absolute, and we would have to check that recursively if the symlink target itself is a symlink, so just fall back to symlink then.

[codecov]

Codecov Report

Merging #5220 (c096125) into master (8d9fc92) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head c096125 differs from pull request most recent head 2cde027. Consider uploading reports for the commit 2cde027 to get more accurate results

@@           Coverage Diff           @@
##           master    #5220   +/-   ##
=======================================
  Coverage   98.30%   98.31%           
=======================================
  Files         389      389           
  Lines       37113    37123   +10     
=======================================
+ Hits        36484    36496   +12     
+ Misses        629      627    -2     

Impacted Files	Coverage Δ
lib/OpenQA/Worker/Engines/isotovideo.pm	97.93% <100.00%> (+0.70%)	⬆️
t/24-worker-engine.t	100.00% <100.00%> (ø)

[perlpunk]

I'm getting a weird failure on circleci:
https://app.circleci.com/pipelines/github/os-autoinst/openQA/11816/workflows/310c0f76-e852-40f1-b121-ff5829f9d4ff/jobs/110462

[11:04:31] t/24-worker-engine.t ...................................... 1/?
 Can't open file "poolAgHr/vars.json": No such file or directory at t/24-worker-engine.t line 60.
# Tests were run but no plan was declared and done_testing() was not seen.
# Looks like your test exited with 255 just after 11.
[11:04:31] t/24-worker-engine.t ......................................       Dubious, test returned 255 (wstat 65280, 0xff00)
All 11 subtests passed

However, the test is passing locally. Not sure what's going on there...

[Martchus]

Looks generally good.

[perlpunk]

I'm getting a weird failure on circleci:

Ah, nevermind, I forgot to commit a new file... should be fixed