Improve text fixture annotation removal regexp

Summary:
We strip annotation lines from the output after applying a fix in tests.
This is done using a regular expression to pick up the `%% ^^^^ error: blah` comment lines.

Impriove this regex
- make the presence of the lightbulb indicating an available assist optional
- Deal more appropriately with annotations of the from `%%<^^ error: foo`

Reviewed By: perehonchuk

Differential Revision: D55966908

fbshipit-source-id: 32eca9f3479dd6c4fd48100c2306a11a8c4e81e2

crates/base_db/src/fixture.rs

@@ -768,7 +768,7 @@ pub fn remove_annotations(marker: Option<&str>, text: &str) -> String {
 /// Check if the given line contains a `%% ^^^ 💡 some text` annotation
 pub fn contains_annotation(line: &str) -> bool {
     lazy_static! {
-        static ref RE: Regex = Regex::new(r"^\s*%%[\s<]+(\^)* +💡.*$").unwrap();
+        static ref RE: Regex = Regex::new(r"^\s*%%( +\^+|[<\^]+) +💡?.*$").unwrap();
     }
     RE.is_match(line)
 }

crates/ide/src/diagnostics.rs

@@ -1943,7 +1943,6 @@ baz(1)->4.
 
              baz()->
                1.
-             %%^^^^^^^ 💡 warning: match is redundant
              "#,
         );
     }

crates/ide/src/diagnostics/unused_include.rs

@@ -619,7 +619,6 @@ foo() -> ok.
 "#,
             r#"
 -module(main).
-  %%^^^^^^^^^^^^^^^^^^^^^^^ 💡 warning: Unused file: header.hrl
 
 foo() -> ok.