Remove code_based_slash_commands_claude_4_0_rollout feature flag

Wanderson Policarporequested to merge
545490-remove-code_based_slash_commands_claude_4_0_rollout-feature-flag into master

What does this MR do and why?

Remove code_based_slash_commands_claude_4_0_rollout feature flag

Assume all .com users will use Claude Sonnet 4 for code-based slash commands by default from now on.

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Related to #545490 (closed)

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