Describe the bug

When sectionFileName inlcov.info file contains .., function checkSectionAbsolute (used to match coverage section and source file) does not work correctly.

To Reproduce
Steps to reproduce the behaviour:

1. lcov.info contains the follow content:

SF:/home/lt/projects/libfuzz/json-c/build/../arraylist.c
FN:40,array_list_new
FN:45,array_list_new2
FN:65,array_list_free
FN:75,array_list_get_idx
FN:107,array_list_shrink
FN:130,array_list_put_idx
...
end_of_record

2. Then, you will found json-c/arraylist.c file will be marked as "No Coverage". Because checkSectionAbsolute only check suffix, and
   sectionFileName is not simplified absolute path.

Expected behaviour

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Extension Version: github master brach
• VSCode Version 1.62.0

Additional context
Add any other context about the problem here.