fix(e2e): remove extra quotes from substring assertions in rh-identity tests

The behave step 'body of the response contains {substring}' captures
the literal text after 'contains', including any quotes. The test
assertions were failing because they searched for quoted substrings
like '"Invalid base64 encoding"' instead of unquoted text that
actually exists in the JSON response body.

Fixes 6 failing test scenarios:
- Invalid base64 encoding detection
- Invalid JSON detection
- Unsupported identity type detection
- Missing required entitlement detection (3 scenarios)

Signed-off-by: Major Hayden <major@redhat.com>

Author: major

tests/e2e/features/authorized_rh_identity.feature

@@ -25,7 +25,7 @@ Feature: Authorized endpoint API tests for the rh-identity authentication module
      {"placeholder":"abc"}
      """
      Then The status code of the response is 400
-      And The body of the response contains "Invalid base64 encoding"
+      And The body of the response contains Invalid base64 encoding
 
   Scenario: Request fails when x-rh-identity header has invalid JSON
     Given The system is in default state
@@ -35,7 +35,7 @@ Feature: Authorized endpoint API tests for the rh-identity authentication module
      {"placeholder":"abc"}
      """
      Then The status code of the response is 400
-      And The body of the response contains "Invalid JSON"
+      And The body of the response contains Invalid JSON
 
   Scenario: Request fails when identity field is missing
     Given The system is in default state
@@ -87,7 +87,7 @@ Feature: Authorized endpoint API tests for the rh-identity authentication module
      {"placeholder":"abc"}
      """
      Then The status code of the response is 400
-      And The body of the response contains "Unsupported identity type"
+      And The body of the response contains Unsupported identity type
 
   Scenario: Request succeeds with valid User identity and required entitlements
     Given The system is in default state
@@ -130,7 +130,7 @@ Feature: Authorized endpoint API tests for the rh-identity authentication module
      {"placeholder":"abc"}
      """
      Then The status code of the response is 403
-      And The body of the response contains "Missing required entitlement"
+      And The body of the response contains Missing required entitlement
 
   Scenario: Request fails when user has no entitlements
     Given The system is in default state
@@ -150,7 +150,7 @@ Feature: Authorized endpoint API tests for the rh-identity authentication module
      {"placeholder":"abc"}
      """
      Then The status code of the response is 403
-      And The body of the response contains "Missing required entitlement"
+      And The body of the response contains Missing required entitlement
 
   Scenario: Request fails when entitlement exists but is_entitled is false
     Given The system is in default state
@@ -170,7 +170,7 @@ Feature: Authorized endpoint API tests for the rh-identity authentication module
      {"placeholder":"abc"}
      """
      Then The status code of the response is 403
-      And The body of the response contains "Missing required entitlement"
+      And The body of the response contains Missing required entitlement
 
   Scenario: Request fails when User identity is missing user field
     Given The system is in default state