fix(ui): multiple instructors are formatted properly, displays last name only, and are capitalized in all course blocks (#342)

[adityamkk]

This PR resolves (#342)
The issue was improper formatting of multiple instructors in course blocks in the calendar and main extension popup.

Here are the changes:

1. Instructor names in course blocks now only display last names
2. Instructor names are spaced with a semicolon in the calendar and main extension popup

Calendar Course Block after the changes:

Main Extension Popup Course Block after the changes:

---

This change is 

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/views/hooks/useFlattenedCourseSchedule.ts

Function	Unhandled Issue
extractCourseInfo	Error: Invalid Instructor String format: first_last Instructor.toString(../../src/shared/types/Instructor.... Event Count: 5 Affected Users: 2

---

_{Did you find this useful? React with a 👍 or 👎}

[Samathingamajig]

code LGTM, awaiting UI/UX review from @IsaDavRod

[IsaDavRod]

LGTM

[Samathingamajig]

LGTM

[IsaDavRod]

LGTM

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Error: Invalid Instructor String format: first_last Instructor.toString(../../src/shared/types/Inst... View Issue

_{Did you find this useful? React with a 👍 or 👎}