Composer: normalize the file, add script descriptions, remove redundant script

[jrfnl]

Summary

This PR can be summarized in the following changelog entry:

• Tidy up composer.json file and improve usability of scripts

Relevant technical choices:

Composer: normalize the file

Well, mostly (scripts are not alphabetized, but still grouped by task).

Note: this is done as a one-time only action. The normalize script will not be run in CI to enforce normalization.

Style has been standardized to --indent-style=tab --indent-size=1.

Ref: https://github.com/ergebnis/composer-normalize

Composer: remove redundant script

This script has been superseded by the Composer plugin handling this automatically.

Composer: add script descriptions

These descriptions will be used when a list of the available scripts is requested on the command-line using the composer list or composer run -l commands.

These descriptions also help document the different scripts for the maintainers of the composer.json file.

Ref: https://getcomposer.org/doc/articles/scripts.md#custom-descriptions-

Test instructions

This PR can be tested by following these steps:

• N/A