Coding Style: Fixed white-space errors as reported by CodeChecker.
Coding Style: Fixed line-length warnings as reported by CodeChecker.
Coding Style: Variables must not contain underscores.
Coding Style: 3 slashes comments are not allowed; use "// Comment" instead
Coding Style: added missing file header
Coding Style: Inline comments must end in full-stops, exclamation marks, or question marks
Coding Style: Inline comments must start with a capital letter, digit or 3-dots sequence
Coding Style: Fixed remaining line-length warnings
Coding Style: The use of function print_r() is forbidden
Merge branch 'code-style-fixes' into MOODLE_23_STABLE

With this change, the CodeChecker module will not report any errors when run against the `mod/adaptivequiz`
path while excluding the `tests/*` path.