feat(ci): Run cron jobs on workflow dispatch

[ncooke3]

Address #15273 (comment)

#no-changelog

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[paulb777]

This PR has a syntax error unreported in this PR but visible looking at the logs:

[Invalid workflow file: .github/workflows/core.yml#L44](https://github.com/firebase/firebase-ios-sdk/actions/runs/17695034629/workflow)
error parsing called workflow
".github/workflows/core.yml"
-> "./.github/workflows/common_cocoapods_cron.yml" (source branch with sha:a74e02174885ac64fd386e78029f6986c4329a2f)
: (Line: 51, Col: 9): Unexpected symbol: '\'. Located at position 53 within expression: github.repository == 'firebase/firebase-ios-sdk' && \
(github.event_name == 'schedule' || github.event_name == 'workflow_dispatch')