update node version to 14.16

[marjisound]

Why are you doing this?

This PR updates node version from 12.13 to 14.16 and also updates github actions setup-node step to use nvmrc

Changes

• updates node version from 12.13 to 14.16
• use guardian/actions-setup-node instead of setup-node in github actions in order to install node based on nvmrc
• Update TeamCity steps to use nvmrc as the node version (Add CI bash script for TeamCity Build #1448)

TODO:

• Update AMI node version

[JamieB-gu]

• updates github actions setup-node step to use nvmrc

How does setup-node know to use .nvmrc?

[marjisound]

• updates github actions setup-node step to use nvmrc

How does setup-node know to use .nvmrc?

Thanks @JamieB-gu for spotting this. I updated the action library to guardian/actions-setup-node. The original action actions/setup-node won't use nvmrc for node version and it recommends that we give node version to it via its node-version parameter while guardian/actions-setup-node would use nvmrc node version if it exists.