improvement(test/swamp): set core IP and Port to nodes

[vgonkivs]

Overview

configure test nodes to be able to access the core node and set keyring from an already funded account in order to submit transactions.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #2226 (a784354) into main (ecf7956) will decrease coverage by 0.13%.
The diff coverage is 96.29%.

@@            Coverage Diff             @@
##             main    #2226      +/-   ##
==========================================
- Coverage   55.89%   55.77%   -0.13%     
==========================================
  Files         216      216              
  Lines       14115    14142      +27     
==========================================
- Hits         7889     7887       -2     
- Misses       5438     5464      +26     
- Partials      788      791       +3     

Impacted Files	Coverage Δ
header/header.go	58.82% <75.00%> (-2.58%)	⬇️
das/subscriber.go	88.23% <100.00%> (ø)
das/worker.go	95.86% <100.00%> (+0.21%)	⬆️

... and 8 files with indirect coverage changes

[Wondertan]

Nice