refactor(report): Don't bother stripping ANSI escape codes

`cargo report` calls `Shell::print_ansi_stdout`.  Previously, it didn't
always strip the colors when needed (e.g. `Write` is used).  Now it
does, so don't need to special case this when generating the report.

src/bin/cargo/commands/report.rs

@@ -44,7 +44,7 @@ fn report_future_incompatibilities(config: &Config, args: &ArgMatches) -> CliRes
         .value_of_u32("id")?
         .unwrap_or_else(|| reports.last_id());
     let krate = args.get_one::<String>("package").map(String::as_str);
-    let report = reports.get_report(id, config, krate)?;
+    let report = reports.get_report(id, krate)?;
     drop_println!(config, "{}", REPORT_PREAMBLE);
     drop(config.shell().print_ansi_stdout(report.as_bytes()));
     Ok(())

src/cargo/core/compiler/future_incompat.rs

@@ -37,7 +37,7 @@ use crate::core::compiler::BuildContext;
 use crate::core::{Dependency, PackageId, Workspace};
 use crate::sources::source::QueryKind;
 use crate::sources::SourceConfigMap;
-use crate::util::{iter_join, CargoResult, Config};
+use crate::util::{iter_join, CargoResult};
 use anyhow::{bail, format_err, Context};
 use serde::{Deserialize, Serialize};
 use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
@@ -224,12 +224,8 @@ impl OnDiskReports {
         self.reports.last().map(|r| r.id).unwrap()
     }
 
-    pub fn get_report(
-        &self,
-        id: u32,
-        config: &Config,
-        package: Option<&str>,
-    ) -> CargoResult<String> {
+    /// Returns an ANSI-styled report
+    pub fn get_report(&self, id: u32, package: Option<&str>) -> CargoResult<String> {
         let report = self.reports.iter().find(|r| r.id == id).ok_or_else(|| {
             let available = iter_join(self.reports.iter().map(|r| r.id.to_string()), ", ");
             format_err!(
@@ -267,13 +263,6 @@ impl OnDiskReports {
         };
         to_display += &package_report;
 
-        let shell = config.shell();
-
-        let to_display = if shell.err_supports_color() && shell.out_supports_color() {
-            to_display
-        } else {
-            anstream::adapter::strip_str(&to_display).to_string()
-        };
         Ok(to_display)
     }
 }