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- Removed outdated warnings about eventual consistency from the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>

nodejs/src/connection.rs

@@ -48,16 +48,8 @@ impl Connection {
     pub async fn new(uri: String, options: ConnectionOptions) -> napi::Result<Self> {
         let mut builder = ConnectBuilder::new(&uri);
         if let Some(interval) = options.read_consistency_interval {
-            match interval {
-                Either::A(seconds) => {
-                    builder = builder.read_consistency_interval(Some(
-                        std::time::Duration::from_secs_f64(seconds),
-                    ));
-                }
-                Either::B(_) => {
-                    builder = builder.read_consistency_interval(None);
-                }
-            }
+            builder =
+                builder.read_consistency_interval(std::time::Duration::from_secs_f64(interval));
         }
         if let Some(storage_options) = options.storage_options {
             for (key, value) in storage_options {