Feat: Set activation height for 2.5 in xenon (mainline) testnet

[kantai]

Description

This sets the activation height for 2.5 in mainline testnet to block 2,583,893. This is 57 blocks before a prepare phase. It is 449 blocks from now (as of opening the PR), which sets an activation height of 3PM eastern time, Thursday.

[CharlieC3]

[obycode]

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.08%. Comparing base (f9e9791) to head (3ebcceb).

Additional details and impacted files

@@             Coverage Diff             @@
##             next    #4588       +/-   ##
===========================================
- Coverage   83.58%   67.08%   -16.50%     
===========================================
  Files         471      466        -5     
  Lines      337958   336699     -1259     
  Branches      317        0      -317     
===========================================
- Hits       282486   225884    -56602     
- Misses      55464   110815    +55351     
+ Partials        8        0        -8     

Files	Coverage Δ
stackslib/src/core/mod.rs	57.87% <ø> (-5.56%)	⬇️

... and 304 files with indirect coverage changes

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