Disable Mixed Comparisons by default

Enabling this feature without Post-Lookup surprisingly can reduce our
support for certain queries.

This is also a partial revert of Iad455b26.  We again pass the argument
explicitly as we did before the change that made this feature enabled by
default.

Change-Id: I81a945f02a94dddbe458cadc539e75afb588d9d7
Reviewed-on: https://gerrit.readyset.name/c/readyset/+/8024
Reviewed-by: Sidney Cammeresi <[email protected]>
Tested-by: Buildkite CI

Author: davisjc

readyset-features.json

@@ -13,7 +13,7 @@
         "command-line": "--feature-mixed-comparisons",
         "environment-variable": "FEATURE_MIXED_COMPARISONS",
         "description": "Enable support for mixing equality and range comparisons on query parameters.",
-        "default": true
+        "default": false
     },
     {
         "feature_id": "3",

readyset-server/src/lib.rs

@@ -654,7 +654,7 @@ pub struct WorkerOptions {
     #[arg(
         long,
         env = "FEATURE_MIXED_COMPARISONS",
-        default_value = "true",
+        default_value = "false",
         default_missing_value = "true",
         num_args = 0..=1,
         action = ArgAction::Set,