Merge separate build spec files into one in correct location

What does this MR do?

This MR merges two separate spec files for Ci::Build into one. The file we merged specs into has a valid location, a removed one was located in invalid directory.

Test examples were also sorted in alphabetical order by method name. We also grouped some related tests inside describe blocks.

What are the relevant issue numbers?

Closes #24579 (closed)