Workaround for MS Edge does not update disabled control's style

[ysds]

Fixes #28247

Before: https://codepen.io/anon/pen/VgEmwV
After: https://codepen.io/anon/pen/PVyGLv

This PR targets the components of the Bootstrap. However, if bootstrap team prefer to fix every situation, it can also add the following CSS to the _reboot.scss.

[disabled] ~ _ {}

[mdo]

@MartijnCuppens I haven't tested or reviewed this myself, but likely a candidate for v4 and then bringing back into v5.

[MartijnCuppens]

I really dislike the attribute selector but if it's the only solution we should do this. We'll revert this again once Edge has switched to Chromium.

[mdo]

Does the attribute selector cover the psuedo class for all browsers?

[ysds]

The [disabled] and :disabled are theoretically different, so we should test on actually devices. I've tested in:

• macOS 10.14.2 Chrome 72.0.3626.109
• macOS 10.14.2 Firefox 65.0.1
• macOS 10.14.2 Safari 12.0.2 (14606.3.4)
• macOS 10.14.2 Opera 58.0.3135.65
• iOS 12.1.4 Chrome 72.0.3626.101
• iOS 12.1.4 Firefox 15.0 (13894)
• iOS 12.1.4 Safari
• iOS 12.1.4 Edge 42.10.3
• Windows 10 1809 Chrome 72.0.3626.109
• Windows 10 1809 Firefox 65.0.1
• Windows 10 1809 IE 11
• Windows 10 1809 Edge 44.17763.1.0
• Android 8.1.0 Nexus 5X Chrome 72.0.3626.105
• Android 8.1.0 Nexus 5X Firefox 65.0.1
• Android 8.1.0 Nexus 5X Edge 42.0.2.3330

[XhmikosR]

Changed the base branch to master. If it's supposed to be backported in 4.x, mark it or something and we'll cherry pick it when we cut the release.