Use v1beta1 for DestinationRules

[npolshakova]

Description

Use v1beta1 for DestinationRules to fix nightly tests failures that use Istio versions < 1.22.0.

API changes

NONE

Code changes

Change networkingclient in proxy syncer to use istio.io/client-go/pkg/apis/networking/v1beta1 instead of v1 which should be present for earlier Istio versions.

CI changes

NONE

Docs changes

NONE

Context

#10399

Interesting decisions

We need to support earlier Istio versions, so adding a version check would limit our support matrix.

Testing steps

Proxy syncer tests are passing with switch

Notes for reviewers

More context: https://solo-io-corp.slack.com/archives/C06C8RA01NF/p1732570082933009

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

[solo-changelog-bot]

Issues linked to changelog:
#10399

[github-actions]

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[danehans]

Rerunning the Kubernetes Tests / End-to-End (cluster-six) job due to #10434.

[danehans]

The Unit Tests / projects/gateway2 (pull_request) job is failing b/c the testdata in projects/gateway2/setup must be updated to support the v1beta1 API version. After updating the testdata, follow the steps in the readme to regenerate the *-out.yaml:

1. Remove the existing generated testdata outputs rm -rf projects/gateway2/setup/testdata/*-out.yaml
2. Run TEST_PKG=./projects/gateway2/setup make go-test. This will fail but it regenerates the *-out.yaml files.
3. Run TEST_PKG=./projects/gateway2/setup make go-test. This should pass.

[danehans]

https://github.com/solo-io/solo-projects/pull/7363 is potentially a dupe.