Hide the Node.js error message when a Docker command produces a non-zero exit code

[johnbillion]

When running a command that goes via docker.js -- for example the PHP unit tests with npm run test:php or a WP-CLI command with npm run env:cli -- a rather verbose and unnecessary error message and stack trace will be shown by Node.js at the end of the output if the target command produces a non-zero exit code.

This can safely be hidden because the stack trace only points to the execSync() call and is of no use.

Let's hide it with a try catch block. The prior output from the target command remains visible.

Trac ticket: https://core.trac.wordpress.org/ticket/62814

## Screenshots

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### After

[johnbillion]

In 59659:

Build/Test Tools: Hide the Node.js error message when a Docker command produces a non-zero exit code.

When running a command that goes via docker.js and produces a non-zero exit code, the error message and stack trace from node an safely be hidden because the stack trace only points to the execSync() call and is of no use.

Fixes #62814

Committed in https://core.trac.wordpress.org/changeset/59659