fix(nextcloud_test): Handle port already used with retries

[provokateurin]

Forgotten in #2769.

On the host network we don't get the 125 status code anymore if the port was already allocated, but just 1. We can't distinguish that from any other failure, so just using retries should do the trick to avoid false positives in case the port is already used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.88%. Comparing base (0388713) to head (eecfc5f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2770   +/-   ##
=======================================
  Coverage   28.88%   28.88%           
=======================================
  Files         373      373           
  Lines      138192   138192           
=======================================
  Hits        39923    39923           
  Misses      98269    98269           

Flag	Coverage Δ		*Carryforward flag
account_repository	98.47% <ø> (ø)
cookie_store	99.48% <ø> (ø)		Carriedforward from 0388713
dashboard_app	96.05% <ø> (ø)
dynamite	31.05% <ø> (ø)		Carriedforward from 0388713
dynamite_end_to_end_test	61.75% <ø> (ø)		Carriedforward from 0388713
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from 0388713
interceptor_http_client	97.18% <ø> (ø)		Carriedforward from 0388713
neon_dashboard	96.05% <ø> (ø)		Carriedforward from 0388713
neon_framework	59.34% <ø> (ø)
neon_http_client	94.32% <ø> (ø)
neon_notifications	100.00% <ø> (ø)		Carriedforward from 0388713
neon_rich_text	100.00% <ø> (ø)
neon_storage	94.66% <ø> (ø)
neon_talk	99.45% <ø> (ø)		Carriedforward from 0388713
nextcloud	24.36% <ø> (ø)
notifications_app	97.36% <ø> (ø)
notifications_push_repository	98.11% <ø> (ø)		Carriedforward from 0388713
sort_box	90.90% <ø> (ø)		Carriedforward from 0388713
talk_app	98.84% <ø> (ø)

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