Upgrade eslint to v8.x

[BilalQamar95]

Ticket
42: Upgrade eslint to v8.x

Description:

• Upgraded eslint to v8.18 along with @edx/eslint-config, @babel/eslint-parser, @babel/core & @babel/preset-react
• Resolved linting issues post upgrade.

[codecov]

Codecov Report

Merging #249 (39d4374) into master (e1c3a8d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #249   +/-   ##
=======================================
  Coverage   67.13%   67.13%           
=======================================
  Files          42       42           
  Lines         782      782           
  Branches      154      154           
=======================================
  Hits          525      525           
  Misses        249      249           
  Partials        8        8           

Impacted Files	Coverage Δ
...omponents/course-enrollments/CourseEnrollments.jsx	80.43% <ø> (ø)

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[davidjoy]

This seems reasonable to me - I think we should just double-check with the owning team since frontend-app-learner-portal-programs is a pretty non-standard MFE.