Fix GetNSPath for ignite

[robertvolkmann]

Containerlab is unable to find the network namespace path using ignite runtime since 0.53.0.

INFO[0001] Networking is handled by "docker-bridge"     
INFO[0001] Started Firecracker VM "5166f4a61292d357" in a container with ID "aad296f2246e7022153a54462c890b8d955218ee8e0501cdf3277b618a879f5c" 
ERRO[0001] Unable to determine NetNS Path for node leaf02: Error response from daemon: No such container: leaf02 
ERRO[0001] failed deploy links for node "leaf02": Error response from daemon: No such container: leaf02 
INFO[0003] Networking is handled by "docker-bridge"     
INFO[0003] Started Firecracker VM "b92c63db14bfbfad" in a container with ID "1c2d5a8b21c99d35a553eaa3c0cffbfee007e4940b8b71ea23ce848d6deaf7f9" 
ERRO[0003] Unable to determine NetNS Path for node leaf01: Error response from daemon: No such container: leaf01 
ERRO[0003] failed deploy links for node "leaf01": Error response from daemon: No such container: leaf01 

Before the refactoring, the ns path was saved in the configuration of the node. Now it is retrieved from the runtime using the LongName, which is the name of the ignite VM.

See: https://github.com/srl-labs/containerlab/pull/1906/files#diff-d25cfdb9022b8a280a3cf87aa5a83926d393e4d5d28c550dd57cca87c9130359R169

Caused by #1906

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 53.59%. Comparing base (f2b4a62) to head (5b9cafd).
Report is 284 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2000      +/-   ##
==========================================
+ Coverage   48.59%   53.59%   +5.00%     
==========================================
  Files         133      160      +27     
  Lines       12789    11536    -1253     
==========================================
- Hits         6215     6183      -32     
+ Misses       5870     4488    -1382     
- Partials      704      865     +161     

Files	Coverage Δ
runtime/ignite/ignite.go	0.40% <0.00%> (+0.09%)	⬆️

... and 125 files with indirect coverage changes

[hellt]

thanks @robertvolkmann !