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