chore: centralize NPM behaviors to a single shared workflow

[metal-messiah]

Update the repo to centralize all workflows that hit NPM to use a single shared workflow to support OIDC trusted publishing requirements.

Overview

Related Issue(s)

Testing

[github-actions]

Supportability Metric Usage Changes:

No matching changes found

Supportability Metrics .md File Changes:

supportability_metrics.md was changed? false

New supportability metrics require changes to supportability_metrics.md, as well as a new PR to Angler. Please ensure an Angler PR is created and linked to this PR.

[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	25.96 kB / 9.8 kB (gzip)	25.96 kB / 9.8 kB (gzip)	0% / 0% (gzip)
lite	async-chunk	53.13 kB / 17.72 kB (gzip)	53.13 kB / 17.72 kB (gzip)	0% / 0% (gzip)
pro	loader	54.48 kB / 19.27 kB (gzip)	54.48 kB / 19.27 kB (gzip)	0% / 0% (gzip)
pro	async-chunk	91.8 kB / 28.82 kB (gzip)	91.8 kB / 28.82 kB (gzip)	0% / 0% (gzip)
spa	loader	63.28 kB / 21.95 kB (gzip)	63.28 kB / 21.95 kB (gzip)	0% / 0% (gzip)
spa	async-chunk	117.21 kB / 36.11 kB (gzip)	117.21 kB / 36.11 kB (gzip)	0% / 0% (gzip)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.60%. Comparing base (3b787b0) to head (984612d).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1604   +/-   ##
=======================================
  Coverage   88.60%   88.60%           
=======================================
  Files         206      206           
  Lines        7746     7751    +5     
  Branches     1584     1588    +4     
=======================================
+ Hits         6863     6868    +5     
  Misses        772      772           
  Partials      111      111           

Flag	Coverage Δ
unit-tests	81.87% <ø> (+<0.01%)	⬆️

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[metal-messiah]

tested manually with the prerelease workflow in dryrun mode https://github.com/newrelic/newrelic-browser-agent/actions/runs/18787081555/job/53607966077

[ellisong]

See comments

[ellisong]

LGTM after I understood why we don't need npm auth. We're moving to OIDC.