Change model picker to include gpt5.1 (#6569)

- Change the presets
- Change the tests that make sure we keep the list of tools updated
- Filter out deprecated models

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_reasoning_selection_popup.snap

@@ -2,7 +2,7 @@
 source: tui/src/chatwidget/tests.rs
 expression: popup
 ---
-  Select Reasoning Level for gpt-5-codex
+  Select Reasoning Level for gpt-5.1-codex
 
   1. Low               Fastest responses with limited reasoning
   2. Medium (default)  Dynamically adjusts reasoning based on the task

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_selection_popup.snap

@@ -5,8 +5,7 @@ expression: popup
   Select Model and Effort
   Access legacy models by running codex -m <model_name> or in your config
 
-› 1. gpt-5-codex (current)  Optimized for codex.
-  2. gpt-5                  Broad world knowledge with strong general
-                            reasoning.
+› 1. gpt-5.1-codex  Optimized for codex.
+  2. gpt-5.1        Broad world knowledge with strong general reasoning.
 
   Press enter to select reasoning effort, or esc to dismiss.

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__rate_limit_switch_prompt_popup.snap

@@ -1,12 +1,11 @@
 ---
 source: tui/src/chatwidget/tests.rs
-assertion_line: 500
 expression: popup
 ---
   Approaching rate limits
-  Switch to gpt-5-codex-mini for lower credit usage?
+  Switch to gpt-5.1-codex-mini for lower credit usage?
 
-› 1. Switch to gpt-5-codex-mini             Optimized for codex. Cheaper,
+› 1. Switch to gpt-5.1-codex-mini           Optimized for codex. Cheaper,
                                             faster, but less capable.
   2. Keep current model
   3. Keep current model (never show again)  Hide future rate limit reminders