Remove PR ID input

[ofalvai]

Checklist

• [ ] I've read and followed the Contribution Guidelines
• [ ] step.yml and README.md is updated with the changes (if needed)

Version

Requires a MAJOR version update

Context

This input is only used in one place, seen in the diff. Even though we check the existence of this input value, we don't read the value ever again, so it doesn't make a change in the step's flow, and the existence of a PR ID is not enough to checkout the PR branch either.

Changes

Remove pull_request_id step input in step.yml and code.

Investigation details

Decisions

README update will come in a follow-up PR

[ofalvai]

Current dependencies on/for this PR:

• next
  • PR #195
  • PR #196 👈
    • PR #197

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