fix: txtar tests load full config and execute serially

[deelawn]

This fixes an issue where executing txtar tests would fail because the example packages weren't loaded into memory.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[gfanton]

thanks! fix a regression introduced by #1241

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (041d0a8) 55.90% compared to head (e8c4eb4) 55.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1342      +/-   ##
==========================================
+ Coverage   55.90%   55.96%   +0.05%     
==========================================
  Files         420      420              
  Lines       65373    65380       +7     
==========================================
+ Hits        36549    36592      +43     
+ Misses      25968    25931      -37     
- Partials     2856     2857       +1     

Files	Coverage Δ
gno.land/pkg/integration/testing_integration.go	79.89% <100.00%> (+0.88%)	⬆️
gno.land/pkg/gnoland/node_inmemory.go	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

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[deelawn]

I moved it back to draft status. There is an issue where running multiple txtar tests (see txtar test added in this PR) results in one of them always failing with the error: Invalid tx [error internal error log recovered: unexpected node with location gno.land/r/foobar/bar/:0. Replace the package path with the package path of the contract of the test that failed.

[moul]

Yes, Txtar enforces for running tasks at the same time.

We need to either improve how Gnoland handles concurrency or change Txtar to run tasks one after the other.

[gfanton]

If it's really a memory problem, another good solution would be to build & exec gnoland the same way we do with gno so it will have its own process, and no more memory conflict.