[internal improvement] from-hardhat: use jest to skip tests

[cds-amal]

This PR fixes an issue on OS X which caused @truffle/from-hardhat to error during yarn test

Error

$ $(yarn bin)/lerna run test --stream --concurrency=1 --scope @truffle/from-hardhat -- --colors
lerna notice cli v4.0.0
lerna info versioning independent
lerna notice filter including "@truffle/from-hardhat"
lerna info filter [ '@truffle/from-hardhat' ]
lerna info Executing command in 1 package: "yarn run test --colors"
yarn run v1.22.19
$ exit 0 --colors
@truffle/from-hardhat: /bin/sh: line 0: exit: too many arguments
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
lerna ERR! yarn run test --colors exited 1 in '@truffle/from-hardhat'

With fix

$ $(yarn bin)/lerna run test --stream --concurrency=1 --scope @truffle/from-hardhat -- --colors
lerna notice cli v4.0.0
lerna info versioning independent
lerna notice filter including "@truffle/from-hardhat"
lerna info filter [ '@truffle/from-hardhat' ]
lerna info Executing command in 1 package: "yarn run test --colors"
yarn run v1.22.19
$ jest --passWithNoTests --colors
@truffle/from-hardhat: No tests found, exiting with code 0
Done in 0.66s.
lerna success run Ran npm script 'test' in 1 package in 0.7s:
lerna success - @truffle/from-hardhat

[lsqproduction]

Neat. Do we change it out when tests do get written into this package?