Generate conformance report and upload to release

[sjberman]

Problem: We want to be able to upload our conformance report for every release, so we can keep the upstream Gateway API tracker for our project up to date.

Solution: Generate the conformance report whenever the tests are run. When a release occurs, we'll upload to the release artifacts.

Testing: Created a release on my fork and verified that the conformance profile was uploaded.

Closes #961

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[sjberman]

@kate-osborn Is summary necessary? You mentioned it in the ticket that we have to manually add it. Just wondering if we need it.

[kate-osborn]

@kate-osborn Is summary necessary? You mentioned it in the ticket that we have to manually add it. Just wondering if we need it.

There was some talk back on a conformance profile PR into the community about requiring summaries, but looking at the committed conformance reports, it doesn't look like they enforce that at all. It's kind of a weird field, not sure how we would generate a meaningful summary anyway.