Update draft PR control

[godrei]

Checklist

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

Version

Requires a PATCH version update

Context

This PR fixes an issue with the previously introduced draft PR trigger control.

The previous implementation couldn't handle properly when a draft PR is converted to a ready-for-review status.

The new implementation compares PR trigger map items to a PR readiness status with three possible values: draft, ready_for_review and converted_to_ready_for_review this way:

If the draft PR trigger is enabled:

• build params with pull_request_ready_state=draft → trigger a build
• build params with pull_request_ready_state=ready_for_review → trigger a build
• build params with pull_request_ready_state=converted_to_ready_for_review → skip build (only the ready state has changed, build was already running on this state of the code)

If the draft PR trigger is disabled:

• build params with pull_request_ready_state=draft → skip a build
• build params with pull_request_ready_state=ready_for_review → trigger a build
• build params with pull_request_ready_state=converted_to_ready_for_review → trigger a build (state changed to ready to review)

The new comparison is aligned with the related webhook service changes: bitrise-io/bitrise-webhooks#158

Changes

• Update TriggerMapItemModel.MatchWithParams based on the above-explained matching logic
• The trigger and trigger-check commands' --draft-pr flag was replaced by the pr-ready-state flag
• The RunAndTriggerParamsModels draft-pr property was replaced by the PRReadyState property