Remove unneeded migration pallets from starlight

[github-actions[bot]]

Coverage Report

(master)

@@                        Coverage Diff                        @@
##           master   tomasz-remove-startlight-migr      +/-   ##
=================================================================
+ Coverage   66.94%                          67.13%   +0.19%     
- Files         250                             249       -1     
- Lines       43712                           43578     -134     
=================================================================
- Hits        29260                           29254       -6     
- Misses      14452                           14324     -128     

Files Changed	Coverage
/solo-chains/runtime/starlight/src/lib.rs	17.89% (-0.40%)	🔽

Coverage generated Fri Jul 5 10:30:10 UTC 2024