DPL-1047-16: Upgrade Node to v16

[StephenHulme]

Moves closer to closing #1541, as upgrading to v20 is non-trivial (see #1555)
Preceeds #1645

Changes proposed in this pull request

• Upgrad Node 14 -> 16

Version 16 checklist:

• rm -fr node_modules
• Update .nvmrc
• nvm install
• nvm use
• yarn install --dev
• yarn prettier --write .
• yarn lint
• yarn test
• ./compile-build
• docker-compose build --no-cache
• docker-compose up

Deployment Instructions

• Needs to be thoroughly tested in UAT before merging and deploying

Instructions for Reviewers

[All PRs] - Confirm PR template filled
[Feature Branches] - Review code
[Production Merges to main]
    - Check story numbers included
    - Check for debug code
    - Check version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.40%. Comparing base (baf1b58) to head (3fe50ed).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1804   +/-   ##
========================================
  Coverage    91.40%   91.40%           
========================================
  Files          376      376           
  Lines         7656     7656           
========================================
  Hits          6998     6998           
  Misses         658      658           

Flag	Coverage Δ
javascript	93.65% <100.00%> (ø)
pull_request	91.40% <100.00%> (?)
push	91.40% <100.00%> (ø)
ruby	91.09% <ø> (ø)

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[codeclimate]

Code Climate has analyzed commit 5175a78 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 91.1% (0.0% change).

View more on Code Climate.