fix(test): remove php_phpactor symlink and add repo alias mapping

Remove the unnecessary php_phpactor -> php symlink. Instead, add a
_LANGUAGE_REPO_ALIASES mapping in conftest.py so that variant language
servers (PHP_PHPACTOR, PYTHON_JEDI, RUBY_SOLARGRAPH) resolve to their
base language's test repository without needing filesystem symlinks.

Addresses review comment on PR #1002.

test/conftest.py

@@ -34,8 +34,16 @@ class LanguageParamRequest:
     param: Language
 
 
+_LANGUAGE_REPO_ALIASES: dict[Language, Language] = {
+    Language.PHP_PHPACTOR: Language.PHP,
+    Language.PYTHON_JEDI: Language.PYTHON,
+    Language.RUBY_SOLARGRAPH: Language.RUBY,
+}
+
+
 def get_repo_path(language: Language) -> Path:
-    return Path(__file__).parent / "resources" / "repos" / language / "test_repo"
+    repo_language = _LANGUAGE_REPO_ALIASES.get(language, language)
+    return Path(__file__).parent / "resources" / "repos" / repo_language / "test_repo"
 
 
 def _create_ls(

test/resources/repos/php_phpactor

@@ -1 +0,0 @@
-php