.github/workflows: disable performance tests

[sam-heilbron]

Description

Disable performance tests from running during nightly tests

Context

nightly tests have been failing for weeks/months, due to out of space issues

Latest logs: https://github.com/solo-io/gloo/actions/runs/12477212932/job/34823088427

# github.com/solo-io/gloo/test/services.test
/opt/hostedtoolcache/go/1.23.3/x64/pkg/tool/linux_amd64/link: mapping output file failed: no space left on device

I created #10534 to track the future work

Interesting decisions

Testing steps

• I used this branch to kick off a nightly run, and observed that performance tests are skipped:

Logs: https://github.com/solo-io/gloo/actions/runs/12483728605

This job was skipped

Notes for reviewers

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[sam-heilbron]

/skip-ci non-functional change, again 3

[nfuden]

Lgtm