feat: hide on-call information

Description

This PR introduces a new PagerDutyCard option (disableOnCall) that allows users to completely hide the on-call section of the card. This feature was requested by several customers.

The on-call section will still be shown by default making this an opt-in feature.

Issue number: #68

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
[x] 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