build: Try in vain to improve CI times

[Yawning]

• I think using the insecure beacon should be faster in theory, try it
  • Seems faster, between 3 to 63 seconds in execution reduction, time to set the option on even more tests.
• Remove/rewrite the rust based runtime tests.

[codecov]

Codecov Report

Merging #4038 (72f5c14) into master (0036da8) will decrease coverage by 0.35%.
The diff coverage is 31.45%.

❗ Current head 72f5c14 differs from pull request most recent head 234e1fe. Consider uploading reports for the commit 234e1fe to get more accurate results

@@            Coverage Diff             @@
##           master    #4038      +/-   ##
==========================================
- Coverage   66.78%   66.43%   -0.36%     
==========================================
  Files         391      411      +20     
  Lines       38138    42317    +4179     
==========================================
+ Hits        25472    28115    +2643     
- Misses       9017    10232    +1215     
- Partials     3649     3970     +321     

Impacted Files	Coverage Δ
go/beacon/api/api.go	38.88% <ø> (ø)
go/common/crypto/mrae/api/api.go	20.00% <ø> (ø)
go/common/badger/migrate.go	4.00% <4.00%> (ø)
go/common/badger/helpers.go	34.61% <11.42%> (-47.74%)	⬇️
go/beacon/api/grpc.go	17.31% <17.31%> (ø)
go/common/crypto/sakg/sakg.go	71.42% <71.42%> (ø)
go/common/crypto/pvss/s11n.go	45.08% <75.00%> (+3.87%)	⬆️
go/common/crypto/sakg/bip32.go	95.74% <95.74%> (ø)
go/beacon/api/pvss.go	80.95% <100.00%> (+5.95%)	⬆️
go/beacon/tests/tester.go	86.44% <100.00%> (+0.47%)	⬆️
... and 243 more

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[Yawning]

This requires #4096, because this PR is the one that found the issue.