Embedding web-worker polyfill breaks sourcemap tools

[richard-cox]

Setup

• Rancher version: 2.9

Describe the bug
The BLOB code from web-worker is minified, and contains source maps that are then passed over by webpack - that creates a situation of minified code inside BLOB inside minified code which confuses some tools, eg.

jantimon/chrome-profile-sourcemap-resolver#4

That could be fixed, but the only reason to do so would be supporting very old (pre-2013) browsers, so we are better off removing the polyfill altogether.

Expected Result
Validation steps for QA

• Browser Tab 1 - Open Pods list and create a trivial pod
• Browser Tab 1 - Open browsers dev tools window --> Network tab --> WS tab --> socket connection for the cluster --> MEssages tab
• Browser Tab 2 - Nav to edit page for pod and edit it
• Browser Tab 1 - See resoure.change message for pod just changed

Notes
Fallback brought in when fixing another issue - #6563

[richard-cox]

/backport v2.10.1

[richard-cox]

/backport v2.9.5