fix: fix regex to match [codecov]'s flags (#6655)
fix: fix regex to match [codecov]'s flags (#6655)

* fix: fix regex to match codecov's flags

Flags Must consist only of alphanumeric characters, '_', '-', or '.' and not exceed 45 characters. 
Flag names will be validated against the following regex. ^[\w\.\-]{1,45}$

* refactor: remove unnecessary escape char in regex

* refactor: fix prettier warnings
badges/shields,badges/shields,badges/shields