fix: repairing failed CI

[Baoyuantop]

Description

Which issue(s) this PR fixes:

1. Due to the issue mentioned in help request: mcp-bridge test failed to execute #12806, we have temporarily skipped the mcp-bridge test in this PR.
2. The httpbin.org service became unstable, preventing tests from running. All httpbin requests in the tests were replaced with a locally deployed httpbin service.

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)

[AlinsRan]

Why does kennethreitz/httpbin need to use different image versions?

[Baoyuantop]

This configuration serves the workflow at https://github.com/apache/apisix/blob/master/.github/workflows/push-dev-image-on-commit.yml

This workflow runs on both amd and arm platforms. kennethreitz/httpbin does not provide an arm image, causing it to fail. Therefore, I used this image here.