Update test setup to index test data after old indexing code removed

- Delete tests testing deprecated server side indexing flows
- Delete `Local(Plaintext|Org|Markdown|Pdf)Config' methods, files and
  references in tests
- Index test data via new helper method, `get_index_files'
  - It is modelled after the old `get_org_files' variants in main app
  - It passes the test data in required format to `configure_content'
    Allows maintaining the more realistic tests from before while
    using new indexing mechanism (rather than the deprecated server
    side indexing mechanism

tests/test_cli.py

@@ -1,49 +1,15 @@
 # Standard Modules
 from pathlib import Path
-from random import random
 
 from khoj.utils.cli import cli
-from khoj.utils.helpers import resolve_absolute_path
 
 
 # Test
 # ----------------------------------------------------------------------------------------------------
 def test_cli_minimal_default():
     # Act
-    actual_args = cli([])
+    actual_args = cli(["-vvv"])
 
     # Assert
-    assert actual_args.config_file == resolve_absolute_path(Path("~/.khoj/khoj.yml"))
-    assert actual_args.regenerate == False
-    assert actual_args.verbose == 0
-
-
-# ----------------------------------------------------------------------------------------------------
-def test_cli_invalid_config_file_path():
-    # Arrange
-    non_existent_config_file = f"non-existent-khoj-{random()}.yml"
-
-    # Act
-    actual_args = cli([f"--config-file={non_existent_config_file}"])
-
-    # Assert
-    assert actual_args.config_file == resolve_absolute_path(non_existent_config_file)
-    assert actual_args.config == None
-
-
-# ----------------------------------------------------------------------------------------------------
-def test_cli_config_from_file():
-    # Act
-    actual_args = cli(["--config-file=tests/data/config.yml", "--regenerate", "-vvv"])
-
-    # Assert
-    assert actual_args.config_file == resolve_absolute_path(Path("tests/data/config.yml"))
-    assert actual_args.regenerate == True
-    assert actual_args.config is not None
+    assert actual_args.log_file == Path("~/.khoj/khoj.log")
     assert actual_args.verbose == 3
-
-    # Ensure content config is loaded from file
-    assert actual_args.config.content_type.org.input_files == [
-        Path("~/first_from_config.org"),
-        Path("~/second_from_config.org"),
-    ]