Aexpect was last used in a selftests before a640bf4.

Signed-off-by: Cleber Rosa <[email protected]>

In 847d536, elementpath and xmlschema were added to the build
requirements with the reasoning that coverage was expanded (the tests
that relied on "them" would be enable at build time).  But, in fact,
only xmlschema was being used at the time, and that remains today.

Let's remove elementpath for a cleaner set of build requirements.

Signed-off-by: Cleber Rosa <[email protected]>

Commit 033e522 enabled the building of plugins' eggs as a pre-merge
check.  This adds the building and uploading of plugins' eggs as part
of the release process.

Signed-off-by: Cleber Rosa <[email protected]>

While building wheels, the following condition was caught:

* Getting build dependencies for wheel...
Traceback (most recent call last):
  File "/home/cleber/.local/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
    main()
  File "/home/cleber/.local/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 335, in main
    json_out['return_val'] = hook(**hook_input['kwargs'])
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/cleber/.local/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
    return hook(config_settings)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/build-env-3g7hr9m7/lib/python3.11/site-packages/setuptools/build_meta.py", line 341, in get_requires_for_build_wheel
    return self._get_build_requires(config_settings, requirements=['wheel'])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/build-env-3g7hr9m7/lib/python3.11/site-packages/setuptools/build_meta.py", line 323, in _get_build_requires
    self.run_setup()
  File "/tmp/build-env-3g7hr9m7/lib/python3.11/site-packages/setuptools/build_meta.py", line 488, in run_setup
    self).run_setup(setup_script=setup_script)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/build-env-3g7hr9m7/lib/python3.11/site-packages/setuptools/build_meta.py", line 338, in run_setup
    exec(code, locals())
  File "<string>", line 43, in <module>
  File "<string>", line 34, in get_long_description
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/build-via-sdist-gu1zghmm/avocado-framework-plugin-varianter-pict-102.0/README.rst'

Which revealed a mistake introduced in 2e0591d that missed the
README.rst for the pict plugin.

Signed-off-by: Cleber Rosa <[email protected]>