ci: remove Operator PR package workflow

[AminChirazi]

Removes the public Operator PR package reusable workflows, caller, self-hosting variant, and their documentation.

Verified:

• workflow deletion inventory
• git diff --check

[Copilot]

🟢 Approval recommended

The change set cleanly removes the targeted workflows and updates documentation accordingly, with no remaining in-repo references found.

Pull request overview

Removes the now-unneeded public “Operator PR package” reusable workflows and updates the repository README to reflect that there are currently no shared workflows hosted here.

Changes:

• Deleted the operator-pr-package reusable workflow and its self-hosting variant.
• Removed the advisory caller workflow that invoked the reusable workflow.
• Updated README.md to remove Operator PR package documentation and state that the repo currently contains no shared workflows.

File summaries

File	Description
README.md	Removes Operator PR package documentation; replaces with a brief statement about current repo purpose/status.
.github/workflows/operator-pr-package.yml	Deletes the reusable workflow for publishing PR packages and syncing PR state to Operator.
.github/workflows/operator-pr-package-self.yml	Deletes the self-hosted variant intended for the automators-com/engineering repo.
.github/workflows/operator-pr-package-caller.yml	Deletes the advisory caller workflow that triggered the reusable workflow on PR/review events.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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