XDP: determine NetworkDevice to use early in startup

[alexpyattaev]

Problem

we do the xdp init steps that requires capabilities quite late in validator process start up. we've already spawned many threads, which will have inherited caps that they do not need, posing security risk.

Summary of Changes

• Move some of the init steps to the early stages in validator startup to "fail fast".
• This should not change any of the core functionality.
• This does not improve security but does improve the startup UX & opens path for further refactoring.
• Follow-up PR will address the loading of eBPF program

See also: #9133

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.6%. Comparing base (ef5d037) to head (1a18408).
⚠️ Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #9649     +/-   ##
=========================================
- Coverage    82.6%    82.6%   -0.1%     
=========================================
  Files         902      903      +1     
  Lines      323498   323498             
=========================================
- Hits       267306   267304      -2     
- Misses      56192    56194      +2     

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