[Maps] Map tiles do not load in IE11

[spong]

Kibana version:
7.4-BC3

Browser version:
IE11

Browser OS version:
Window 8.1 VM

Original install method (e.g. download page, yum, from source, etc.):
Elastic Cloud

Describe the bug:
Loading the Maps app, or Network page of SIEM App which contains an embedded map, results in the map tiles not loading, and an error in the dev console.

Steps to reproduce:

1. Load Maps App or Network page of SIEM App
2. Observe tiles are not loaded and errors in console

Screenshots (if relevant):

Errors in browser console (if relevant):

Production build error:

WEBGL11258: Temporarily switching to software rendering to display WebGL content.
SCRIPT5: Access is denied.
File: vendors.bundle.dll.js, Line: 367, Column: 444240
SCRIPT5022: [object ErrorEvent]
File: vendors.bundle.dll.js, Line: 48, Column: 1271280

Dev build error:

SCRIPTS: Access is denied.
File: mapbox-gl.js, Line: 28, Column: 13423
(webpack://%5Bname%5D/./node_modules/mapbox-gl/dist/mapbox-gl.js?)

Any additional context:

Original SIEM issue here: #44155

[elasticmachine]

Pinging @elastic/kibana-gis

[rashmivkulkarni]

This is a regression. Works on IE11 on 7.3.2 BC1 . Just tested on cloud.

[nreese]

This is a regression. Works on IE11 on 7.3.2 BC1 . Just tested on cloud.

Just merged fix to 7.4 branch that will fix this issue in next 7.4 BC