CICD: Optimizing CircleCI cache usage

[algojack]

We have 3 caches:

1. go mod + go sum
2. libsodium
3. go cache

Changes:

• remove save after test stage (we don't need it)
• make keys for caches not depend on stage name, but instead only on arch and OS, for better reuse
• made go-cache save on every commit instead of each build
• one of the keys was using a deprecated/non-working variable, changed it to a working one
• invalidated cache by changing key name (also updating it for go-cache to be golang specific)

Tested in circleci by re-running

[codecov]

Codecov Report

Merging #4087 (6200d7d) into master (febeb1e) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4087      +/-   ##
==========================================
- Coverage   54.55%   54.50%   -0.05%     
==========================================
  Files         391      391              
  Lines       48662    48662              
==========================================
- Hits        26546    26524      -22     
- Misses      19890    19916      +26     
+ Partials     2226     2222       -4     

Impacted Files	Coverage Δ
agreement/cryptoVerifier.go	67.60% <0.00%> (-2.12%)	⬇️
agreement/proposalManager.go	96.07% <0.00%> (-1.97%)	⬇️
node/node.go	22.42% <0.00%> (-1.87%)	⬇️
catchup/service.go	68.88% <0.00%> (-1.24%)	⬇️
data/transactions/verify/txn.go	44.15% <0.00%> (-0.87%)	⬇️
network/wsNetwork.go	64.98% <0.00%> (-0.29%)	⬇️
network/wsPeer.go	68.21% <0.00%> (-0.28%)	⬇️
ledger/acctupdates.go	69.56% <0.00%> (+0.13%)	⬆️
data/abi/abi_type.go	88.62% <0.00%> (+0.94%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

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