Update each tracks tests.toml file

In #362 a tests.toml file was added to each track in order to track the list of implemented tests for that exercise. By default every test was listed as existing, which I doubt is the reality. We need to go through each test to match the implementation here with the problem specifications repo.

More details in #362

- [ ] acronym
- [ ] all-your-base
- [ ] allergies
- [ ] anagram
- [ ] armstrong-numbers
- [ ] atbash-cipher
- [ ] beer-song
- [ ] binary
- [ ] binary-search
- [ ] binary-search-tree
- [ ] bob
- [ ] circular-buffer
- [ ] clock
- [ ] collatz-conjecture
- [ ] complex-numbers
- [ ] crypto-square
- [ ] difference-of-squares
- [ ] etl
- [ ] food-chain
- [ ] gigasecond
- [ ] grade-school
- [ ] grains
- [ ] hamming
- [ ] hello-world
- [ ] hexadecimal
- [ ] isogram
- [ ] leap
- [ ] luhn
- [ ] matching-brackets
- [ ] meetup
- [ ] nth-prime
- [ ] nucleotide-count
- [ ] pangram
- [ ] pascals-triangle
- [ ] phone-number
- [ ] prime-factors
- [ ] protein-translation
- [ ] queen-attack
- [ ] raindrops
- [ ] reverse-string
- [ ] rna-transcription
- [ ] robot-name
- [ ] robot-simulator
- [ ] roman-numerals
- [ ] say
- [ ] scrabble-score
- [ ] secret-handshake
- [ ] series
- [ ] sieve
- [ ] space-age
- [ ] sum-of-multiples
- [ ] triangle
- [ ] trinary
- [ ] two-fer
- [ ] word-count

各トラックの tests.toml ファイルを確認し、そこに記載されたテストのステータスを、対応する演習の実装および問題仕様リポジトリと比較します。まず issue の演習リストから始めてください。すべての tests.toml に、指定されたテストのうちどれが実装されているかが正確に記録されれば、作業は完了です。

索引モデルが issue の本文から書いたものです。