debugger: Remove feature flag (#32877)

Release Notes:

- debugger: Now available for everyone!

Cargo.lock

@@ -4278,7 +4278,6 @@ dependencies = [
  "db",
  "debugger_tools",
  "editor",
- "feature_flags",
  "file_icons",
  "futures 0.3.31",
  "fuzzy",
@@ -4746,7 +4745,6 @@ dependencies = [
  "dap",
  "db",
  "emojis",
- "feature_flags",
  "file_icons",
  "fs",
  "futures 0.3.31",
@@ -19994,7 +19992,6 @@ dependencies = [
  "extension",
  "extension_host",
  "extensions_ui",
- "feature_flags",
  "feedback",
  "file_finder",
  "fs",