Fix type-inference error messages for server update (#391)

## Usage and product changes
Update expected error messages to reflect changes in server's error messages.

Author: krishnangovindraj

driver/query.feature

@@ -1366,7 +1366,7 @@ Feature: Driver Query
      This isnt valid TypeQL;
     """
 
-    Then typeql analyze; fails with a message containing: "Type-inference was unable to find compatible types for the pair of variables 'x' & 'p' across a constraint"
+    Then typeql analyze; fails with a message containing: "Type-inference was unable to find compatible types for the pair of variables 'x' & 'p' across a 'isa' constraint"
     """
     match
      $p sub! person; $x isa! $p;

query/analyze/structure.feature

@@ -291,7 +291,7 @@ Feature: Analyzed query structure
      This isnt valid TypeQL;
     """
 
-    Then typeql analyze; fails with a message containing: "Type-inference was unable to find compatible types for the pair of variables 'x' & 'p' across a constraint"
+    Then typeql analyze; fails with a message containing: "Type-inference was unable to find compatible types for the pair of variables 'x' & 'p' across a 'isa' constraint"
     """
     match
      $p sub! person; $x isa! $p;

query/language/insert.feature

@@ -232,7 +232,7 @@ Feature: TypeQL Insert Query
       $x has ref 0;
       """
     When connection open write transaction for database: typedb
-    When typeql write query; fails with a message containing: "Type-inference derived an empty-set for some variable"
+    When typeql write query; fails with a message containing: "Type-inference was unable to find compatible types for the pair of variables"
       """
       insert
       $x isa person, has ref $age;