chore: Add missing GHA deps

[ptang-nr]

GitHub Actions require the actions/checkout package in order for workflows to run.

Overview

In this PR, include the following missing dependencies that are required for the delete-experiment and branch-cleanup actions to run:

• actions/checkout - always required essentially
• actions/setup-node - since our actions will require node to run

Related Issue(s)

https://new-relic.atlassian.net/browse/NR-347721

Testing

Replicated workflow in a private repo and successfully tested:

Delete Experiment

Prepare all required actions
Run ./.github/actions/s3-delete
Run npm install --prefix $GITHUB_ACTION_PATH/..
  
npm warn deprecated formidable@1.[2](https://github.com/ptang-nr/test-browser-app/actions/runs/12484778541/job/34842658805#step:5:2).6: Please upgrade to latest, formidable@v2 or formidable@v3! Check these notes: https://bit.ly/2ZEqIau
npm warn deprecated [email protected]: Please upgrade to v9.0.0+ as we have fixed a public vulnerability with formidable dependency. Note that v9.0.0+ requires Node.js v[14](https://github.com/ptang-nr/test-browser-app/actions/runs/12484778541/job/34842658805#step:5:16).18.0+. See https://github.com/ladjs/superagent/pull/1800 for insight. This project is supported and maintained by the team at Forward Email @ https://forwardemail.net
added 208 packages, and audited 209 packages in 14s
25 packages are looking for funding
  run `npm fund` for details
found 0 vulnerabilities
Run node $GITHUB_ACTION_PATH/index.js \
  
Bucket name: ***
Looking up files with prefix 'experiments//ptang-add-github-actions'
Found 0 matching files
No files found to delete
Completed successfully

Branch Cleanup
Dev

Prepare all required actions
Run ./.github/actions/s3-delete
Run npm install --prefix $GITHUB_ACTION_PATH/..
  
npm warn deprecated formidable@1.[2](https://github.com/ptang-nr/test-browser-app/actions/runs/12484791423/job/34842692385#step:5:2).6: Please upgrade to latest, formidable@v2 or formidable@v3! Check these notes: https://bit.ly/2ZEqIau
npm warn deprecated [email protected]: Please upgrade to v9.0.0+ as we have fixed a public vulnerability with formidable dependency. Note that v9.0.0+ requires Node.js v[14](https://github.com/ptang-nr/test-browser-app/actions/runs/12484791423/job/34842692385#step:5:15).18.0+. See https://github.com/ladjs/superagent/pull/1800 for insight. This project is supported and maintained by the team at Forward Email @ https://forwardemail.net
added 208 packages, and audited 209 packages in 17s
25 packages are looking for funding
  run `npm fund` for details
found 0 vulnerabilities
Run node $GITHUB_ACTION_PATH/index.js \
  
This is a dry run.
Bucket name: ***
Looking up files with prefix 'experiments/dev/ptang/add-github-actions'
Found 0 matching files
Completed successfully

Staging

Prepare all required actions
Run ./.github/actions/s3-delete
Run npm install --prefix $GITHUB_ACTION_PATH/..
  
up to date, audited [2](https://github.com/ptang-nr/test-browser-app/actions/runs/12484791423/job/34842692385#step:6:2)09 packages in 1s
25 packages are looking for funding
  run `npm fund` for details
found 0 vulnerabilities
Run node $GITHUB_ACTION_PATH/index.js \
  
This is a dry run.
Bucket name: ***
Looking up files with prefix 'experiments/staging/ptang/add-github-actions'
Found 0 matching files
Completed successfully

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	30.13 kB / 10.86 kB (gzip)	30.13 kB / 10.86 kB (gzip)	0% / 0% (gzip)
lite	async-chunk	53.39 kB / 17.35 kB (gzip)	53.39 kB / 17.35 kB (gzip)	0% / 0% (gzip)
pro	loader	51.67 kB / 17.76 kB (gzip)	51.67 kB / 17.76 kB (gzip)	0% / 0% (gzip)
pro	async-chunk	101.99 kB / 31.12 kB (gzip)	101.99 kB / 31.12 kB (gzip)	0% / 0% (gzip)
spa	loader	59.29 kB / 20.1 kB (gzip)	59.29 kB / 20.1 kB (gzip)	0% / 0% (gzip)
spa	async-chunk	116.66 kB / 35.39 kB (gzip)	116.66 kB / 35.39 kB (gzip)	0% / 0% (gzip)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.99%. Comparing base (a6a1bb7) to head (4100a69).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1297   +/-   ##
=======================================
  Coverage   88.99%   88.99%           
=======================================
  Files         170      170           
  Lines        7431     7431           
  Branches     1497     1497           
=======================================
  Hits         6613     6613           
  Misses        697      697           
  Partials      121      121           

Flag	Coverage Δ
unit-tests	79.52% <ø> (ø)

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