Remove LLMCapability.Temperature from GPT-5 model capabilities (#1277)

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## Motivation and Context
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Fixes GPT 5 does not support temperature. #1263

## Breaking Changes
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#### Type of the changes
- [ ] New feature (non-breaking change which adds functionality)
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Tests improvement
- [ ] Refactoring

#### Checklist
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Author: aozherelyeva

prompt/prompt-executor/prompt-executor-clients/prompt-executor-openai-client/src/commonMain/kotlin/ai/koog/prompt/executor/clients/openai/OpenAIModels.kt

@@ -378,7 +378,6 @@ public object OpenAIModels : LLModelDefinitions {
             provider = LLMProvider.OpenAI,
             id = "gpt-5",
             capabilities = listOf(
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -409,7 +408,6 @@ public object OpenAIModels : LLModelDefinitions {
             provider = LLMProvider.OpenAI,
             id = "gpt-5-mini",
             capabilities = listOf(
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -441,7 +439,6 @@ public object OpenAIModels : LLModelDefinitions {
             provider = LLMProvider.OpenAI,
             id = "gpt-5-nano",
             capabilities = listOf(
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -473,7 +470,6 @@ public object OpenAIModels : LLModelDefinitions {
             id = "gpt-5-codex",
             capabilities = listOf(
                 LLMCapability.Completion,
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -531,7 +527,6 @@ public object OpenAIModels : LLModelDefinitions {
             id = "gpt-5.1",
             capabilities = listOf(
                 LLMCapability.Completion,
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -563,7 +558,6 @@ public object OpenAIModels : LLModelDefinitions {
             id = "gpt-5.1-codex",
             capabilities = listOf(
                 LLMCapability.Completion,
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -595,7 +589,6 @@ public object OpenAIModels : LLModelDefinitions {
             id = "gpt-5.2",
             capabilities = listOf(
                 LLMCapability.Completion,
-                LLMCapability.Temperature,
                 LLMCapability.Schema.JSON.Basic,
                 LLMCapability.Schema.JSON.Standard,
                 LLMCapability.Speculation,
@@ -629,7 +622,6 @@ public object OpenAIModels : LLModelDefinitions {
             id = "gpt-5.2-pro",
             capabilities = listOf(
                 LLMCapability.Completion,
-                LLMCapability.Temperature,
                 LLMCapability.Speculation,
                 LLMCapability.Tools,
                 LLMCapability.ToolChoice,