fix: revert change default read_consistency_interval=5s (#2327)

This reverts commit a547c523c2 or #2281

The current implementation can cause panics and performance degradation.
I will bring this back with more testing in
https://github.com/lancedb/lancedb/pull/2311

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Documentation**
- Enhanced clarity on read consistency settings with updated
descriptions and default behavior.
- Removed outdated warnings about eventual consistency from the
troubleshooting guide.

- **Refactor**
- Streamlined the handling of the read consistency interval across
integrations, now defaulting to "None" for improved performance.
  - Simplified internal logic to offer a more consistent experience.

- **Tests**
- Updated test expectations to reflect the new default representation
for the read consistency interval.
- Removed redundant tests related to "no consistency" settings for
streamlined testing.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

python/python/tests/test_db.py

@@ -3,6 +3,7 @@
 
 
 import re
+from datetime import timedelta
 import os
 
 import lancedb
@@ -298,11 +299,13 @@ def test_create_exist_ok(tmp_db: lancedb.DBConnection):
 @pytest.mark.asyncio
 async def test_connect(tmp_path):
     db = await lancedb.connect_async(tmp_path)
-    assert str(db) == f"ListingDatabase(uri={tmp_path}, read_consistency_interval=5s)"
-
-    db = await lancedb.connect_async(tmp_path, read_consistency_interval=None)
     assert str(db) == f"ListingDatabase(uri={tmp_path}, read_consistency_interval=None)"
 
+    db = await lancedb.connect_async(
+        tmp_path, read_consistency_interval=timedelta(seconds=5)
+    )
+    assert str(db) == f"ListingDatabase(uri={tmp_path}, read_consistency_interval=5s)"
+
 
 @pytest.mark.asyncio
 async def test_close(mem_db_async: lancedb.AsyncConnection):
@@ -450,7 +453,7 @@ async def test_open_table(tmp_path):
     assert tbl.name == "test"
     assert (
         re.search(
-            r"NativeTable\(test, uri=.*test\.lance, read_consistency_interval=5s\)",
+            r"NativeTable\(test, uri=.*test\.lance, read_consistency_interval=None\)",
             str(tbl),
         )
         is not None