Add displayname annotations

[bibekparajuli123]

pull request

This PR adds 'DisplayName' annotations to the test methods for the following practice exercises:
pov
prime-factors
protein-translation
proverb
pythagorean-triplet
queen-attack
rail-fence-cipher
raindrops
rational-numbers
react

Descriptions were taken from the corresponding canonical-data.json files in the problem-specifications repo.

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[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[jagdish-15]

Suggested change

	@DisplayName("cannot attack if falling diagonals are only the same " +
	"when reflected across the longest falling diagonal")
	@DisplayName(
	"cannot attack if falling diagonals are only the same " +
	"when reflected across the longest falling diagonal"
	)

Just this small change to keep it consistent with the earlier files!