Remove unsupported always-auth input from setup-node steps

[johnrb2]

Description of the change

actions/setup-node@v6 no longer recognizes the always-auth input and logs a warning on every run in both jobs:

##[warning]Unexpected input(s) 'always-auth', valid inputs are ['node-version', ...]

The input was a no-op under v6 — the private @activeprospect scope authenticates via the committed .npmrc (//registry.npmjs.org/:_authToken=${NPM_TOKEN}), not via setup-node. Removing it from all three setup-node steps (deploy + both test jobs) clears the warnings and changes no behavior. Verified against the last green deploy run (private dep installed successfully with the input already being ignored).

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• UI Change Only
• Chore
• Configuration change
• Technical Debt
• Documentation

Related tickets

sc-112520

Checklists

Development and Testing

• Lint rules pass locally.
• The code changed/added as part of this pull request has been covered with tests, or this PR does not alter production code. (Workflow-only change; no production code.)
• All tests related to the changed code pass in development, or tests are not applicable.

Code Review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached.
• At least two engineers have been added as "Reviewers" on the pull request.
• Changes have been reviewed by at least two other engineers who did not write the code.
• This branch has been rebased off master to be current.

Tracking

• Issue from Shortcut/Jira has a link to this pull request.
• This PR has a link to the issue in Shortcut.

QA

• This branch has been deployed to staging and tested. (CI validates both workflows; deploy is workflow_dispatch and will be exercised on the next staging deploy.)

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