This internal function takes named character vectors (e.g., `tests_skipped`, `tests_passing`) from a list and converts them into data frames for easier reporting or processing.
convert_vectors_to_df(x, elems)A named list of data frames, where each data frame has one column:
The file names or paths from the original character vector.
A list containing character vectors (e.g., `test_results`).
A character vector of element names to convert (must exist in `x`).