fix: readme referenced a deleted script

- Added a script to simplify running the js tests
- Updated readme
5 jobs for 69-upgrade-python-validator-packages in 1 minute and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Lint
passed #944034
docker
lint

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  Build
passed #944035
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build

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  Test
passed #944036
shell
test

00:00:26

passed #944037
shell
test-js

00:00:21

 
  Tag Docker
passed #944038
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tag_docker

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