Add test bib files for entry editor behavior

src/test/resources/testbib/README.md

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+# Test bib files
+
+- `Chocolate.bib`: Library demonstrating JabRef features
+- `entry-editor-tabs-biblatex.bib`: Minimal `.bib` file to demonstrate entry editor tab behavior
+  - entry `a`: Tab "Optional fields" should be shown
+  - entry `b`: Tabs "Optional fields" and "Other fields" should be shown
+- `entry-editor-tabs-bibtex.bib`: Minimal `.bib` file to demonstrate entry editor tab behavior
+  - entry `a`: Tabs "Optional fields" and "Optional fields 2" should be shown
+  - entry `b`: Tabs "Optional fields", "Optional fields 2", and "Other fields" should be shown

src/test/resources/testbib/entry-editor-tabs-biblatex.bib

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+@Article{a,
+  title = {entry with standard fields},
+}
+
+@Article{b,
+  title          = {entry with non-standard fields},
+  mycustomfields = {test},
+}
+
+@Comment{jabref-meta: databaseType:biblatex;}

src/test/resources/testbib/entry-editor-tabs-bibtex.bib

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+@Article{a,
+  title = {entry with standard fields},
+}
+
+@Article{b,
+  title          = {entry with non-standard fields},
+  mycustomfields = {test},
+}
+
+@Comment{jabref-meta: databaseType:bibtex;}