go/oasis-test-runner/cmd: Limit scenario name regex matching

[tjanez]

Prevent oasis-test-runner to match too many scenarios for a given scenario name regex by ensuring the given scenario name regex matches the whole scenario name.

For example, previously, using

oasis-test-runner --test a [... other arguments ...]

would match and run all the following scenarios:

e2e/runtime/runtime-dynamic
e2e/runtime/keymanager-replication
e2e/gas-fees/staking
e2e/runtime/byzantine/executor-straggler
e2e/runtime/gas-fees/runtimes
e2e/node-upgrade
e2e/runtime/keymanager-upgrade
e2e/runtime/runtime-upgrade
e2e/gas-fees/staking-dump-restore
e2e/early-query
e2e/stake-cli
e2e/runtime/byzantine/merge-honest
e2e/runtime/storage-sync
remote-signer/basic
e2e/runtime/byzantine/merge-wrong
e2e/runtime/byzantine/merge-straggler
e2e/runtime/byzantine/executor-honest
e2e/node-upgrade-cancel
e2e/runtime/keymanager-restart
e2e/runtime/halt-restore
e2e/runtime/late-start
e2e/runtime/byzantine/executor-wrong

Now, it doesn't match any scenario.

If one wants to match something like before, he needs to explicitly add wildcards, e.g.:

oasis-test-runner --test .*a.* [... other arguments ...]

[codecov]

Codecov Report

Merging #3103 into master will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3103      +/-   ##
==========================================
+ Coverage   68.30%   68.38%   +0.07%     
==========================================
  Files         372      372              
  Lines       36896    36896              
==========================================
+ Hits        25201    25230      +29     
+ Misses       8436     8406      -30     
- Partials     3259     3260       +1     

Impacted Files	Coverage Δ
go/consensus/tendermint/apps/roothash/query.go	68.42% <0.00%> (-10.53%)	⬇️
go/runtime/client/watcher.go	73.84% <0.00%> (-4.62%)	⬇️
.../consensus/tendermint/apps/roothash/state/state.go	68.62% <0.00%> (-3.93%)	⬇️
go/consensus/tendermint/roothash/roothash.go	66.00% <0.00%> (-1.99%)	⬇️
...consensus/tendermint/apps/registry/transactions.go	55.49% <0.00%> (-1.61%)	⬇️
go/worker/common/committee/group.go	80.88% <0.00%> (-0.69%)	⬇️
go/consensus/tendermint/abci/state.go	68.02% <0.00%> (-0.69%)	⬇️
.../consensus/tendermint/apps/registry/state/state.go	58.61% <0.00%> (-0.56%)	⬇️
go/consensus/tendermint/abci/mux.go	68.43% <0.00%> (-0.47%)	⬇️
go/consensus/tendermint/tendermint.go	64.91% <0.00%> (-0.22%)	⬇️
... and 15 more

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