docs: update Repository secrets references to PSGALLERY_API_KEY

[tablackburn]

Summary

• Updates the README's "Repository secrets" table and surrounding paragraph to use PSGALLERY_API_KEY (the renamed secret).
• Simplifies the previous "set the secret as PS_GALLERY_KEY but the env var is PSGALLERY_API_KEY" caveat now that the secret name matches what PowerShellBuild reads.
• Adds a CHANGELOG entry under [Unreleased] / Changed documenting the rename and the migration steps for existing modules created from this template.

Context

This is the docs cleanup that follows the workflow-side rename in PR #25. The 5 consumer modules (JsmOperations, SrrDBAutomationToolkit, ReScenePS, PlexAutomationToolkit, ScheduledTasksManager) have all had their workflows + secrets rotated to the new name as well.

Test plan

• CI passes (PSScriptAnalyzer Lint + Unit Tests×3 OS)

Verified 2026-05-10: PR head a2faf26 check-runs all green — PSScriptAnalyzer Lint, Unit Tests (ubuntu/macOS/windows-latest) all success.

• Markdown still renders correctly on GitHub

Verified 2026-05-10: GitHub /readme HTML endpoint returns rendered markdown-body article for main; README.md content has 2× PSGALLERY_API_KEY refs and 0× PS_GALLERY_KEY refs; Repository secrets section (1221 chars) intact.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4a4a9ed8-66c0-4d14-8ae5-8941a0b7271f

📥 Commits

Reviewing files that changed from the base of the PR and between 0125a71 and a2faf26.

📒 Files selected for processing (2)

• CHANGELOG.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/secret-name-rename

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[Copilot]

Pull request overview

Updates template documentation to reflect the renamed PowerShell Gallery publish secret so that README guidance and changelog match the current GitHub Actions workflow configuration (introduced in PR #25).

Changes:

• Renames the documented publish secret in the README “Repository secrets” section to PSGALLERY_API_KEY and removes the old mapping caveat.
• Adds an [Unreleased] / Changed changelog entry describing the rename and migration steps for existing modules.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
README.md	Updates the “Repository secrets” table and explanatory text to use PSGALLERY_API_KEY.
CHANGELOG.md	Documents the secret rename and provides migration instructions under [Unreleased].

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