Add Tests for Different Changelog Format with Non-Italicized Dates

[kateliu20]

This is related to a previous PR that was just merged, about different formatting with italicized / non italicized entry dates. I created test cases in ChangelogParserNoItalicsTest.kt that are now passing because of the pushed change.

Here are the current tests in a different file, but the new tests are in this change.

This is to account for the different possible local date formats found in markdown files.

Here is the side by side comparison of the tests, just removing the "_" to see if the parser is able to still work with a different local date format:

[github-actions]

1. Remove the unnecessary comments at the beginning of the file.
2. Use a more descriptive name for the test class, such as "ChangelogParserTest".
3. Use more meaningful test method names that describe the specific scenario being tested.
4. Use a consistent indentation style throughout the code.
5. Remove the unnecessary import statement for java.time.LocalDate.
6. Use a more descriptive variable name for the input string in each test method.
7. Use a more descriptive variable name for the expectedDate in each test method.
8. Use a more descriptive variable name for the expectedString in each test method.
9. Remove the unnecessary trimIndent() calls in the test methods.
10. Use a consistent formatting style for the test method parameters and return types.
11. Use a consistent formatting style for the test method assertions.
12. Consider using a test framework like JUnit 5 instead of JUnit 4 for more advanced testing features.
13. Consider adding more test cases to cover different scenarios and edge cases.