Address regressions due to changes in node

[jkrems]

• Handle switch to file URLs
• Handle change in sourceText formatting (different new lines, no more CJS wrapper)
• Handle change in step behavior (there is no more break step at the beginning of the CJS wrapper function)

To clean up the breakpoint matching, I pulled that regex into a dedicated helper in the test harness for launching the CLI.

[jkrems]

Both nvm exec 10 npm t and nvm exec 12 npm t now pass which should be good enough (and at the very least is a big improvement).

[jkrems]

/cc @nodejs/diagnostics

[jkrems]

This seems like a good opportunity to a) enable these tests in the node CI runs and/or b) update the status of node-inspect in the diagnostics tool status MD file.