fix: courseCode and sectionCode are inconsistent

[KevinWu098]

Context

WebSOC declares the five digit string which represents a section in a given quarter as a "course code" (e.g. 35560 -> ICS 31 Lec in Winter 25). However, the Anteater API describes "course code" as "section code", which is a more accurate name for the value. AntAlmanac's codebase generally agrees with this renaming, using sectionCode ~250 times.

Issue

Across AntAlmanac's codebase, there are also roughly ~30 instances where we refer to the five digit numeric string which represents a section in a given quarter, as a "Course Code" (e.g. courseCode).

This inconsistency is most prominent when we encode course/section codes as courseCode, and decode the value as such. This is problematic because we would then query Anteater API with courseCode as a field, which returns nothing as the Anteater API does not accept such a field.

Example: This link, https://antalmanac.com/?courseCode=35510, which we provide from the actions cell dropdown in the search pane, doesn't work.

Solution

In every case where courseCode is referenced in business logic, we should correctly rename and rewrite to use sectionCode instead. For user-facing content (such as the manual search input), we could continue to match WebSOC, but I'm of the opinion that we should agree with Anteater API and use section code there as well.