[FVM] unsafeRandom for script execution does not error

[tarakby]

This PR enables cadence's unsafeRandom for script execution instead of erroring. This allows scripts not to panic although the returned random value is not equal to the value returned when run as a transaction.

This behaviour is clarified in onflow/flips#120 (onflow/flips@051c82b)

[github-actions]

FVM Benchstat comparison

This branch with compared with the base branch onflow:master commit 6ece1c3

The command (for i in {1..7}; do go test ./fvm ./engine/execution/computation --bench . --tags relic -shuffle=on --benchmem --run ^$; done) was used.

Collapsed results for better readability

	old.txt	new.txt
	time/op		delta
ComputeBlock/16/cols/128/txes/1/max-concurrency-2	6.08s ± 0%	6.17s ± 0%	~	(p=1.000 n=1+1)
ComputeBlock/16/cols/128/txes/2/max-concurrency-2	6.43s ± 0%	6.47s ± 0%	~	(p=1.000 n=1+1)
	us/tx		delta
ComputeBlock/16/cols/128/txes/1/max-concurrency-2	2.97k ± 0%	3.01k ± 0%	~	(p=1.000 n=1+1)
ComputeBlock/16/cols/128/txes/2/max-concurrency-2	3.14k ± 0%	3.16k ± 0%	~	(p=1.000 n=1+1)
	alloc/op		delta
ComputeBlock/16/cols/128/txes/1/max-concurrency-2	1.67GB ± 0%	1.65GB ± 0%	~	(p=1.000 n=1+1)
ComputeBlock/16/cols/128/txes/2/max-concurrency-2	1.71GB ± 0%	1.70GB ± 0%	~	(p=1.000 n=1+1)
	allocs/op		delta
ComputeBlock/16/cols/128/txes/1/max-concurrency-2	22.0M ± 0%	21.9M ± 0%	~	(p=1.000 n=1+1)
ComputeBlock/16/cols/128/txes/2/max-concurrency-2	22.6M ± 0%	22.6M ± 0%	~	(p=1.000 n=1+1)

[codecov-commenter]

Codecov Report

Merging #4604 (e97a236) into master (2528190) will decrease coverage by 1.70%.
Report is 479 commits behind head on master.
The diff coverage is 63.25%.

@@            Coverage Diff             @@
##           master    #4604      +/-   ##
==========================================
- Coverage   56.25%   54.55%   -1.70%     
==========================================
  Files         653      915     +262     
  Lines       64699    85352   +20653     
==========================================
+ Hits        36396    46567   +10171     
- Misses      25362    35200    +9838     
- Partials     2941     3585     +644     

Flag	Coverage Δ
unittests	54.55% <63.25%> (-1.70%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
cmd/bootstrap/transit/cmd/utils.go	31.54% <ø> (ø)
cmd/execution_builder.go	0.00% <0.00%> (ø)
engine/access/rest/middleware/metrics.go	0.00% <0.00%> (ø)
engine/access/rest/routes/execution_result.go	56.75% <0.00%> (ø)
engine/access/rpc/backend/backend_network.go	34.11% <0.00%> (ø)
engine/access/state_stream/engine.go	0.00% <0.00%> (ø)
engine/common/rpc/convert/blocks.go	78.76% <ø> (ø)
fvm/environment/env.go	100.00% <ø> (ø)
model/flow/identifierList.go	22.36% <0.00%> (+0.84%)	⬆️
model/verification/chunkDataPackRequest.go	43.75% <0.00%> (-6.25%)	⬇️
... and 101 more

... and 245 files with indirect coverage changes