feat: hide trigger incident on missing integration key

[t1agob]

Description

This PR introduces a behaviour change when the integration key is missing from an entity configuration. Currently the behaviour is to disable the button but keep it on the screen.

After discussing the plugin with several customers, many shared with us that they don't want people to manually create incidents from Backstage as incidents are automatically created from alerts. Therefore we decided to remove the button if the integration key is not provided as part of the entity configuration, like we already do when the readonly parameter is passed to the PagerDutyCard.

This also allows us to save some valuable space in the PagerDutyCard.

Issue number: #67

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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