DPL-1047: Upgrade to Node 20

[StephenHulme]

Closes #1541

Changes proposed in this pull request

• Upgrade to Node 20 (current LTS production version)
• Update Docker to use Node 20

Checklist

Version 20 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

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 74.54%. Comparing base (93ff0e0) to head (4bc2dd3).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1555   +/-   ##
========================================
  Coverage    74.54%   74.54%           
========================================
  Files          421      421           
  Lines        14379    14379           
========================================
  Hits         10719    10719           
  Misses        3660     3660           

Flag	Coverage Δ
javascript	59.64% <ø> (ø)
pull_request	74.54% <ø> (?)
push	74.54% <ø> (ø)
ruby	91.19% <ø> (ø)

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[sdjmchattie]

Well this was much less complicated than the migration to 18

[codeclimate]

Code Climate has analyzed commit 4bc2dd3 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.