Fixes and Extends BibliographyConsistencyCheck.check to Handle Custom Entry Types

[Hrishi-Baskaran]

Closes #13794

This fixes an issue with the consistency check. The consistency check is not supposed to check for required fields but does anyways. It does it incorrectly regardless. I removed the check for required fields entirely and modified the relevant test cases. I next plan to write tests for consistency checks that involve the entry type manager for custom entry types. I do not need feedback yet, but I don't mind receiving some.

Steps to test

One can test this feature by running the relevant test case: BibliographyConsistencyCheckTest.checkFieldEntriesWithFieldDifferences.

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• I manually tested my changes in running JabRef (always required)
• I added JUnit tests for changes (if applicable)
• I added screenshots in the PR description (if change is visible to the user)
• I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• I checked the user 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 updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[github-actions]

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