Fixed upstream filter disabled by default

[andy-fong]

Commit Message: Fixed upstream filter disabled by default Additional Description: Fixes https://github.com/envoyproxy/envoy/issues/39587 Risk Level: low Testing: Added tests in the header mutation integration tests to make sure upstream filter can be disabled and re-enabled or vice versa at all config levels. Docs Changes: None Release Notes:

[repokitteh-read-only[bot]]

Hi @andy-fong, welcome and thank you for your contribution.

We will try to review your Pull Request as quickly as possible.

In the meantime, please take a look at the contribution guidelines if you have not done so already.

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/39878 was opened by andy-fong.

see: more, trace.

[andy-fong]

@paul-r-gall updated base on your comments but I didn't change all the existing EXPECT_EQ. Do I resolve the comments after I push the update or the reviewer will resolve once the change is satisfactory?

[andy-fong]

The failure seems to be un-related to my change. bazel was failing to download something, so might be transient. Can someone re-run that test?

[paul-r-gall]

/retest