feat: hide on-call information

[t1agob]

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

• 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

• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• Changes generate no new warnings
• 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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