fix: remove config definitions that are secret

Description

Removes the pagerDuty.apiToken and pagerDuty.oauth configuration definitions from this repository as they should be treated as secret config and this frontend plugin does not need to know about them.

See https://github.com/PagerDuty/backstage-plugin-backend/pull/36 for a related PR to mark those configuration values as secret.

Type of change

[ ] New feature (non-breaking change which adds functionality)
[x] 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