Fix for issue 13234

[YaxPrajapti]

Closes #13234

This PR enhances the "Citation relations" feature by making the "Look up a DOI and try again." text a clickable hyperlink. On clicking, the text changes to "Looking up DOI...". Based on the lookup result:

If a DOI is found, it is used for citation relations.

If no DOI is found, a notification "No DOI found" is shown and the link resets to its original state.

Steps to test

• Add a paper in jabRef entry editor.
• Go to citation relations. You will see hyperlink. Click on that hyperlink.

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• [/] Tests created for changes (if applicable)
• [/] Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (if change is visible to the user)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[jabref-machine]

Your pull request conflicts with the target branch.

Please merge upstream/main with your code. For a step-by-step guide to resolve merge conflicts, see https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/addressing-merge-conflicts/resolving-a-merge-conflict-using-the-command-line.

[trag-bot]

The hyperlink text 'Lookup a DOI and try again.' should be sentence case, starting with a lowercase letter, to maintain consistency with other UI elements.

[trag-bot]

The notification message 'No DOI found' should be sentence case, starting with a lowercase letter, to maintain consistency with other UI elements.

[koppor]

Follow-up #13285

@YaxPrajapti No need to delete branches and close PRs. Please just add new commits. In the concrete case, continue to work on fix-for-issue-13234 and keep it open!