#62221 Ensure context.runId is always coerced to a string

[johnbillion]

context.runId is an integer, which doesn't seem to be accepted for the run_id input in the failed-workflow.yml workflow. This fixes that, and also updates two missed instances of inline expressions.

Trac ticket: https://core.trac.wordpress.org/ticket/62221

[desrosj]

Let's give it a shot!

[github-actions]

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Props johnbillion, desrosj.

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[github-actions]

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[johnbillion]

Committed in https://core.trac.wordpress.org/changeset/59687