feat(jira-backend): export the JiraConfig class

[anicke]

This is needed to be able to use the exported searchJira function in other backend plugins since the jira config instance is now an argument.

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• [X] I have performed a self-review of my own code
• [X] I have verified that the code builds perfectly fine on my local system
• [X] I have verified that my code follows the style already available in the repository
• [X] A changeset describing the change and affected packages. (more info)
• [X] Added or updated documentation

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 8eb288fc7489f61d9df5ce8ee90b648d4d655a64

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | --------------------------------------------- | ----- | | @axis-backstage/plugin-jira-dashboard-backend | Patch | | backend | Patch |

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