fix: Update message loading to work for wrapped and unwrapped message files.

[maribethb]

The basics

• I branched from develop
• My pull request is against develop
• My code follows the style guide
• I ran npm run format and npm run lint

The details

Resolves

#6123

Proposed Changes

• This is a patch release containing fix: Make message files work in unpackaged mode, and rebuild msg files #6329 and rebuilt files.
• Update version number to 8.0.5
• Run npm run build and npm run checkin:built. I actually did this before updating the version number and there were no changes. After updating the version number there are now changes to all of the .map files, so I assume these are legitimate changes related to the source code in blockly_compressed changing, even though I don't have an explanation for what those might be. But I'm going to assume that Closure Compiler is working correctly here.

Tested this via a subset of the tests I ran yesterday covering the three use cases:

• imported blockly via a module
• script tags requiring wrapped messages
• script tags requiring unwrapped messages