Settings screen lacks JS error handling

[westonruter]

Bug Description

When on WordPress 5.3.8, accessing the AMP Settings screen with AMP v2.1.1 results in a blank settings screen with a JS error in the console:

rtl.js:84 Uncaught TypeError: Object(...) is not a function
    at rtl.js:84
    at Module../node_modules/@wordpress/components/build-module/select-control/styles/select-control-styles.js (select-control-styles.js:59)
    at __webpack_require__ (bootstrap:19)
    at Module../node_modules/@wordpress/components/build-module/select-control/index.js (index.js:1)
    at __webpack_require__ (bootstrap:19)
    at Module../node_modules/@wordpress/components/build-module/custom-gradient-picker/index.js (index.js:1)
    at __webpack_require__ (bootstrap:19)
    at Module../node_modules/@wordpress/components/build-module/gradient-picker/index.js (index.js:1)
    at __webpack_require__ (bootstrap:19)
    at Module../node_modules/@wordpress/components/build-module/index.js (index.js:1)
(anonymous) @ rtl.js:84
./node_modules/@wordpress/components/build-module/select-control/styles/select-control-styles.js @ select-control-styles.js:59
__webpack_require__ @ bootstrap:19
./node_modules/@wordpress/components/build-module/select-control/index.js @ index.js:1
__webpack_require__ @ bootstrap:19
./node_modules/@wordpress/components/build-module/custom-gradient-picker/index.js @ index.js:1
__webpack_require__ @ bootstrap:19
./node_modules/@wordpress/components/build-module/gradient-picker/index.js @ index.js:1
__webpack_require__ @ bootstrap:19
./node_modules/@wordpress/components/build-module/index.js @ index.js:1
__webpack_require__ @ bootstrap:19
./assets/src/components/loading/index.js @ amp-settings.js?ver=6b389aa5fc09f404606dae2886ade7ad:1183
__webpack_require__ @ bootstrap:19
(anonymous) @ amp-settings.js?ver=6b389aa5fc09f404606dae2886ade7ad:4267
./assets/src/settings-page/index.js @ amp-settings.js?ver=6b389aa5fc09f404606dae2886ade7ad:4476
__webpack_require__ @ bootstrap:19
2 @ module.js:22
__webpack_require__ @ bootstrap:19
(anonymous) @ bootstrap:83
(anonymous) @ bootstrap:83

The error here is originating our entrypoint. We should wrap this with a try/catch block to show an error message with the details, including a link to submit a support topic with the associated stack trace.

Note that this specific issue with WordPress 5.3.8 is fixed by #6225, but we should have such error handling regardless.

Expected Behaviour

Errors should not cause a blank screen.

Steps to reproduce

1. Install WordPress 5.3.8.
2. Activate AMP v2.1.1
3. Access the AMP Settings screen.

Screenshots

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Acceptance criteria

Implementation brief

QA testing instructions

Demo

Changelog entry

[westonruter]

QA Passed

JS disabled:

JS error in api-fetch.min.js:

JS error in lodash.min.js, after 30 second timeout: