Investigate why E2E tests fail

[jolampi]

Since ~last week, E2E tests have been failing with the following message:

🚨  /home/runner/work/python-editor/python-editor/node_modules/@fortawesome/react-fontawesome/index.es.js: Unknown version 59 of op_mob
    at Function.select (/usr/local/lib/node_modules/parcel-bundler/node_modules/browserslist/index.js:1101:17)
    at /usr/local/lib/node_modules/parcel-bundler/node_modules/browserslist/index.js:336:33
    at Array.reduce (<anonymous>)
    at resolve (/usr/local/lib/node_modules/parcel-bundler/node_modules/browserslist/index.js:318:18)
    at browserslist (/usr/local/lib/node_modules/parcel-bundler/node_modules/browserslist/index.js:443:21)
    at getTargets (/usr/local/lib/node_modules/parcel-bundler/node_modules/@babel/helper-compilation-targets/lib/index.js:199:48)
    at /usr/local/lib/node_modules/parcel-bundler/node_modules/@babel/preset-env/lib/index.js:258:57
    at Object.default (/usr/local/lib/node_modules/parcel-bundler/node_modules/@babel/helper-plugin-utils/lib/index.js:19:12)
    at getEnvPlugins (/usr/local/lib/node_modules/parcel-bundler/src/transforms/babel/env.js:62:34)
    at getEnvConfig (/usr/local/lib/node_modules/parcel-bundler/src/transforms/babel/env.js:21:28)

The issue seems to be retroactively affecting previous commits also. The topic was discussed and resolved in these issues:

• BrowserslistError: Unknown version 59 of op_mob parcel-bundler/parcel#5164
• Unknown version 59 of op_mob browserslist/browserslist#537

Unfortunately, initial attempts at resolving it didn't work. Hence this issue to check back into it later.