fix: append subdirectory to archive path (#7575)

[harrymander]

Resolves: #7575

• Added tests for changed code.
• Updated documentation for changed code. (N/A)

From @nikowatari's suggestion (#755 (comment)) with added test.

[radoering]

LGTM.

In addition, I think we can remove

poetry/src/poetry/installation/executor.py

Lines 589 to 596 in 3e32a4f

	assert package.source_url is not None
	if package.root_dir:
	req = package.root_dir / package.source_url
	else:
	req = Path(package.source_url).resolve(strict=False)
	if package.source_subdirectory:
	req /= package.source_subdirectory

because this part was supposed to consider the subdirectory but apparently it does nothing.

[radoering]

Actually, if we remove this code, we don't need _prepare_directory_archive at all, but can call _prepare_archive directly. 🤔

[harrymander]

Yep those lines do nothing... have removed

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