feat: added support for SCHEDULED_EVENT in platform_workers_service resource

[andreasvikke]

Summary

This PR adds support for the SCHEDULED_EVENT action type to the platform_workers_service resource as addressed in #197. The changes include a new schedule block, API model wiring, and an acceptance test. It also updates documentation for acceptance test environment variables and extends the changelog.

---

Changes

• platform_workers_service resource

  • Adds "SCHEDULED_EVENT" to the list of valid action values.

  • Extends filter_criteria with an optional schedule block:

    filter_criteria = {
      schedule = {
        cron     = "<cron expression>"
        timezone = "<timezone>" # optional
      }
    }

  • Makes artifact_filter_criteria optional and adds an ExactlyOneOf validator so that either artifact_filter_criteria or schedule is configured (but not both).

• Adds TestAccWorkersService_Schedule acceptance tests

• Changes ARTIFACTORY_* to JFROG_* in CONTRIBUTIONS.md

Notes

• The change is designed to be backwards compatible:

  • Existing configurations using artifact_filter_criteria continue to work.
  • The new schedule block is optional and mutually exclusive with artifact_filter_criteria.

[andreasvikke]

I have read the CLA Document and I hereby sign the CLA

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[andreasvikke]

@srinivasgowda097 @chukka Would it be possible to take a look at this contribution?