tests: dynamically search for deep mutable properties

[jansegre]

Motivation

We recently fixed some mutability cases exposed to blueprints, namely some self.syscall.rng.* cases. But we don't have a test that dynamically checks for attributes that are possible to mutate.

Acceptance Criteria

• Create a blueprint (with special access to dir builtin and try blocks) that does a search starting from self and ctx: Context looking for attributes (including nested attributes) that would be possible to be changed from normal blueprint code (either overwritten with a new value or deleted).

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	tests/check-mutable-properties
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.64 m (-0.18%) Baseline: 1.64 m	1.48 m (90.16%)	1.80 m (90.74%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.65%. Comparing base (8849a23) to head (eb64e24).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1340      +/-   ##
==========================================
+ Coverage   85.59%   85.65%   +0.05%     
==========================================
  Files         424      424              
  Lines       32119    32119              
  Branches     4997     4997              
==========================================
+ Hits        27493    27512      +19     
+ Misses       3620     3606      -14     
+ Partials     1006     1001       -5     

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