Out of sync practice exercises

[github-actions]

Out of sync practice exercises have been detected:

Command: configlet sync --tests --docs --metadata --filepaths

Output:

Checking exercises...
[warn] docs: instructions unsynced: affine-cipher
[warn] docs: instructions unsynced: atbash-cipher
[warn] docs: instructions unsynced: collatz-conjecture
[warn] docs: introduction missing: collatz-conjecture
[warn] docs: introduction unsynced: eliuds-eggs
[warn] docs: instructions unsynced: grade-school
[warn] docs: instructions unsynced: knapsack
[warn] docs: introduction unsynced: knapsack
[warn] docs: introduction missing: phone-number
[warn] metadata: unsynced: atbash-cipher
[warn] metadata: unsynced: collatz-conjecture
[warn] pig-latin: missing 1 test case
       - first letter and ay are moved to the end of words that start with consonants -> word beginning with consonant and vowel containing qu (e59dbbe8-ccee-4619-a8e9-ce017489bfc0)
[warn] some exercises have unsynced docs
[warn] some exercises have unsynced metadata
[warn] some exercises are missing test cases