fakejira: use key instead of name for issue creation

[AlexNPavel]

Jira uses the project key to construct the issue key.

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[k8s-ci-robot]

@bradmwilliams: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubernetes-sigs/prow/pull/229#pullrequestreview-2238456113): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexNPavel, bradmwilliams, petr-muller

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Needs approval from an approver in each of these files: - ~~[pkg/jira/OWNERS](https://github.com/kubernetes-sigs/prow/blob/main/pkg/jira/OWNERS)~~ [AlexNPavel,petr-muller] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment