theme_importer: Make VS Code theme parsing more lenient (#7292)

This PR updates the `theme_importer` to use `serde_json_lenient` to
parse VS Code themes.

This should allow us to parse themes that have trailing commas and such,
in addition to the comment support that we already had.

Release Notes:

- N/A

crates/theme_importer/Cargo.toml

@@ -13,7 +13,6 @@ convert_case = "0.6.0"
 gpui = { path = "../gpui" }
 indexmap = { version = "1.6.2", features = ["serde"] }
 indoc.workspace = true
-json_comments = "0.2.2"
 log.workspace = true
 palette = { version = "0.7.3", default-features = false, features = ["std"] }
 pathfinder_color = "0.5"
@@ -21,6 +20,7 @@ rust-embed.workspace = true
 schemars = { workspace = true, features = ["indexmap"] }
 serde.workspace = true
 serde_json.workspace = true
+serde_json_lenient.workspace = true
 simplelog = "0.9"
 strum = { version = "0.25.0", features = ["derive"] }
 theme = { path = "../theme" }

crates/theme_importer/src/main.rs

@@ -9,7 +9,6 @@ use std::path::PathBuf;
 use anyhow::{Context, Result};
 use clap::{Parser, Subcommand};
 use indexmap::IndexMap;
-use json_comments::StripComments;
 use log::LevelFilter;
 use schemars::schema_for;
 use serde::Deserialize;
@@ -132,8 +131,7 @@ fn main() -> Result<()> {
         }
     };
 
-    let theme_without_comments = StripComments::new(theme_file);
-    let vscode_theme: VsCodeTheme = serde_json::from_reader(theme_without_comments)
+    let vscode_theme: VsCodeTheme = serde_json_lenient::from_reader(theme_file)
         .context(format!("failed to parse theme {theme_file_path:?}"))?;
 
     let theme_metadata = ThemeMetadata {