Bug fix: add debugGlobal default to config

[eggplantzzz]

Addresses #5828

PR description

There is a property that gets set on config (during testing) named debugGlobal. Currently Truffle relies on the yargs builder object to set this property which is jank. It is also causing problems where it doesn't get set when you miskey truffle test. There is an issue for this bug here. This PR adds a proper default for this value in @truffle/config.

Testing instructions

Run truffle tes on the command line. Verify that Truffle correctly runs the tests. If you currently try this on published Truffle, it will fail.

Documentation

• I thought about documentation and added the doc-change-required label to this PR if documentation updates are required.

Breaking changes and new features

• I have added any needed breaking-change and new-feature labels for the appropriate packages.

[cds-amal]

Looks good to me! Weird how this bug manifested.

[lsqproduction]

What's this debugGlobal?

[eggplantzzz]

It looks like it is the variable name used for setting break points when using the debugger. The default case is that it is called "debug". Someone can correct me, of course, if I'm wrong about that.

[dongmingh]

With this fix, truffle tes succeeds.

[haltman-at]

It looks like it is the variable name used for setting break points when using the debugger. The default case is that it is called "debug". Someone can correct me, of course, if I'm wrong about that.

Well, they're not really break points; it lets you break into the debugger to debug particular transactions, but it doesn't let you set breakpoints inside of them, nor breakpoints outside of them for that matter.