feat: support hide credentials for jwt-auth plugin

[pixeldin]

Description

Provides an optional feat for the jwt-auth plugin to hide authentication upstream as requested in #8122.
Setting hide_credentials to true in the plugin config will hide related auth parameters in upstream.

Fixes #8122

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[spacewander]

@pixeldin
Could you apply this patch in your code before we can merge it?
Thanks!

diff --git t/plugin/jwt-auth3.t t/plugin/jwt-auth3.t
index c0a1961d..fd53d56a 100755
--- t/plugin/jwt-auth3.t
+++ t/plugin/jwt-auth3.t
@@ -30,10 +30,10 @@ add_block_preprocessor(sub {

     if (!defined $block->request) {
         $block->set_value("request", "GET /t");
-    }

-    if (!$block->response_body) {
-        $block->set_value("response_body eval", "qr/^$/");
+        if (!$block->response_body) {
+            $block->set_value("response_body", "passed\n");
+        }
     }
 });

[pixeldin]

@pixeldin Could you apply this patch in your code before we can merge it? Thanks!

diff --git t/plugin/jwt-auth3.t t/plugin/jwt-auth3.t
index c0a1961d..fd53d56a 100755
--- t/plugin/jwt-auth3.t
+++ t/plugin/jwt-auth3.t
@@ -30,10 +30,10 @@ add_block_preprocessor(sub {

     if (!defined $block->request) {
         $block->set_value("request", "GET /t");
-    }

-    if (!$block->response_body) {
-        $block->set_value("response_body eval", "qr/^$/");
+        if (!$block->response_body) {
+            $block->set_value("response_body", "passed\n");
+        }
     }
 });

@spacewander Thanks, Done! Please review it when you have time.