🐛 #2617 Selecting fixed subnet when provided

[nonowheels63]

What this PR does / why we need it:
This PR enable the usage of a provided subnet when it is provided. At first the provided network wasn't used when the there where multiple subnet attached to the network, one random subnet was used (the first returned by the api).

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 #2617

Special notes for your reviewer:
This is the first PR i have ever made.
I have redo the work on the release-0.12 and the main branches if needed.

TODOs:

• squashed commits
• if necessary:
  • includes documentation
  • adds unit tests

/hold

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[EmilienM]

Pease first propose a fix into main, and then we'll think about backporting. We can't fix a bug in a stable branch first.
/hold

[nonowheels63]

Hello,
I proposed a fix into main, do i have to close this PR or will it be closed automatically ?

[lentzi90]

Closing. Let's take it into main and then we do the backport