refactor: enable PagerDuty option on PagerDutyPage

Description

This PR enables the PagerDuty option in the PagerDutyPage component settings which allows users to set PagerDuty as their main source for syncing service dependencies to Backstage.

This feature was disabled due to a limitation on version 0.3.0 of @pagerduty/backstage-plugin-entity-processor which is now fixed and released on version 0.3.1.

Issue number: N/A

Type of change

[x] New feature (non-breaking change which adds functionality)
[ ] Fix (non-breaking change which fixes an issue)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

[x] I have performed a self-review of this change
[x] Changes have been tested
[ ] Changes are documented
[x] Changes generate no new warnings
[x] PR title follows conventional commit semantics

If this is a breaking change 👇

[ ] I have documented the migration process
[ ] I have implemented necessary warnings (if it can live side by side)

Acknowledgement

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PagerDuty / backstage-plugin