Add some analysis excludes for pkg/front_end.

pkg/front_end/.analysis_options

Index: pkg/front_end/.analysis_options
diff --git a/pkg/front_end/.analysis_options b/pkg/front_end/.analysis_options
index 9a5216af285e6e97eaffc1b4a6ad96b034341000..61936d8ce50b96d5f5e320b37789a19ebca40b02 100644
--- a/pkg/front_end/.analysis_options
+++ b/pkg/front_end/.analysis_options
@@ -2,8 +2,11 @@ analyzer:
   strong-mode: true
   language:
     enableSuperMixins: true
+  exclude:
+    # TODO(devoncarew): Without this exclude I see ~400 analysis errors.
+    - test/fasta/**
   errors:
-    # Omits warnigns due to missing `@virtual`
+    # Omits warnings due to missing `@virtual`
     # TODO(sigmund): enable once #28601 is fixed
     strong_mode_invalid_field_override: ignore
 
@@ -15,6 +18,6 @@ analyzer:
     # Allow having TODOs in the code
     todo: ignore
 
-    # Allow deprecated calls (althout it would be nice to have a distinction
+    # Allow deprecated calls (although it would be nice to have a distinction
     # between internal and external deprecated calls).
     deprecated_member_use: ignore