Switch from 'include_package_data' to 'package_data'

[cottsay]

The former results in quite a few warning messages during the package build with modern setuptools, such as:

********************************************************************************
############################
# Package would be ignored #
############################
Python recognizes 'ros_buildfarm.templates.status.js' as an importable package[^1],
but it is absent from setuptools' `packages` configuration.

This leads to an ambiguous overall configuration. If you want to distribute this
package, please make sure that 'ros_buildfarm.templates.status.js' is explicitly added
to the `packages` configuration field.

Alternatively, you can also rely on setuptools' discovery methods
(for example by using `find_namespace_packages(...)`/`find_namespace:`
instead of `find_packages(...)`/`find:`).

You can read more about "package discovery" on setuptools documentation page:

- https://setuptools.pypa.io/en/latest/userguide/package_discovery.html

If you don't want 'ros_buildfarm.templates.status.js' to be distributed and are
already explicitly excluding 'ros_buildfarm.templates.status.js' via
`find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
you can try to use `exclude_package_data`, or `include-package-data=False` in
combination with a more fine grained `package-data` configuration.

You can read more about "package data files" on setuptools documentation page:

- https://setuptools.pypa.io/en/latest/userguide/datafiles.html


[^1]: For Python, any directory (with suitable naming) can be imported,
      even if it does not contain any `.py` files.
      On the other hand, currently there is no concept of package data
      directory, all directories are treated like packages.
********************************************************************************

[cottsay]

Hmm, looks like this broke Python 3.6 somehow. Reverting to draft.

[cottsay]

For the curious: it looks like recursive glob support was added to setuptools in v62.3.0, and for whatever reason, pip is installing v59 for Python 3.6 and older.

I switched to non-recursive globs and it appears to have resolved the problem.

[j-rivero]

Can not find any problem with the transition of the configuration. Left a minor comment on the glob expressions. Approved anyway.