fix: Revert "fix: hardcode max vm cycles in keeper"

[ajnavarro]

Reverts #1807

This PR is causing problems in some realms because the maximum limit is too low.

[codecov]

Codecov Report

Attention: Patch coverage is 53.33333% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 45.04%. Comparing base (69811ff) to head (703c525).

Files	Patch %	Lines
gno.land/pkg/gnoland/node_inmemory.go	0.00%	5 Missing ⚠️
gno.land/pkg/gnoland/app.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1902      +/-   ##
==========================================
- Coverage   47.74%   45.04%   -2.70%     
==========================================
  Files         393      464      +71     
  Lines       61629    67983    +6354     
==========================================
+ Hits        29424    30623    +1199     
- Misses      29734    34787    +5053     
- Partials     2471     2573     +102     

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[leohhhn]

Let's merge this and make an analysis on gas/cpu cycle usage, and think of more appropriate numbers from that.