[APM] Icons don't display on service map in Internet Explorer

[smith]

In Internet Explorer 11, icons did not display on on the map and the map was completely broken, as reported in #55184. We explicitly disabled loading the problematic icons in #55848.

Make it so the experience of showing icons in IE is the same as other browsers.

Some possible options:

• Load SVGs as static asset requests instead of loading them inline with Webpack
• Use PNGs instead of SVGs
• Modify the existing SVGs so the error doesn't happen.

The error causing the problem in #55184 said, "Unexpected call to method or property access.", and looks like the same thing that was reported in cytoscape/cytoscape.js#1990.

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)