Remove unused Entry to Jsonl converter from text to entry class, tests

This was earlier used when the index was plaintext jsonl file. Now
that documents are indexed in a DB this func is not required.

Simplify org,md,pdf,plaintext to entries tests by removing the entry
to jsonl conversion step

src/khoj/processor/content/markdown/markdown_to_entries.py

@@ -123,8 +123,3 @@ class MarkdownToEntries(TextToEntries):
         logger.debug(f"Converted {len(parsed_entries)} markdown entries to dictionaries")
 
         return entries
-
-    @staticmethod
-    def convert_markdown_maps_to_jsonl(entries: List[Entry]):
-        "Convert each Markdown entry to JSON and collate as JSONL"
-        return "".join([f"{entry.to_json()}\n" for entry in entries])

src/khoj/processor/content/org_mode/org_to_entries.py

@@ -146,8 +146,3 @@ class OrgToEntries(TextToEntries):
                 )
 
         return entries
-
-    @staticmethod
-    def convert_org_entries_to_jsonl(entries: Iterable[Entry]) -> str:
-        "Convert each Org-Mode entry to JSON and collate as JSONL"
-        return "".join([f"{entry_dict.to_json()}\n" for entry_dict in entries])

src/khoj/processor/content/pdf/pdf_to_entries.py

@@ -106,8 +106,3 @@ class PdfToEntries(TextToEntries):
         logger.debug(f"Converted {len(parsed_entries)} PDF entries to dictionaries")
 
         return entries
-
-    @staticmethod
-    def convert_pdf_maps_to_jsonl(entries: List[Entry]):
-        "Convert each PDF entry to JSON and collate as JSONL"
-        return "".join([f"{entry.to_json()}\n" for entry in entries])

src/khoj/processor/content/plaintext/plaintext_to_entries.py

@@ -87,8 +87,3 @@ class PlaintextToEntries(TextToEntries):
                 )
             )
         return entries
-
-    @staticmethod
-    def convert_entries_to_jsonl(entries: List[Entry]):
-        "Convert each entry to JSON and collate as JSONL"
-        return "".join([f"{entry.to_json()}\n" for entry in entries])

src/khoj/processor/content/text_to_entries.py

@@ -244,11 +244,6 @@ class TextToEntries(ABC):
 
         return entries_with_ids
 
-    @staticmethod
-    def convert_text_maps_to_jsonl(entries: List[Entry]) -> str:
-        # Convert each entry to JSON and write to JSONL file
-        return "".join([f"{entry.to_json()}\n" for entry in entries])
-
     @staticmethod
     def clean_field(field: str) -> str:
         return field.replace("\0", "") if not is_none_or_empty(field) else ""