Fix staticcheck in test/integration/{examples,framework}

[tiloso]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
PR cleans up the issues identified by staticcheck in test/integration/examples and test/integration/framework:

test/integration/examples/apiserver_test.go:80:2: the goroutine calls T.Fatal, which must be called in the same goroutine as the test (SA2002)
test/integration/examples/apiserver_test.go:93:4: call to T.Fatal
test/integration/examples/apiserver_test.go:134:12: kubeClient.Discovery().ServerResources is deprecated: use ServerGroupsAndResources instead.  (SA1019)
test/integration/framework/etcd.go:103:3: printf-style function with dynamic format string and no further arguments should use print-style function instead (SA1006)
test/integration/framework/test_server.go:128:2: the goroutine calls T.Fatal, which must be called in the same goroutine as the test (SA2002)
test/integration/framework/test_server.go:130:4: call to T.Fatal

Which issue(s) this PR fixes:
Part of #92402

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[k8s-ci-robot]

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[oomichi]

/ok-to-test
/cc @oomichi

[oomichi]

/lgtm
/approve

[oomichi]

/assign @BenTheElder

[oomichi]

/priority backlog
/triage accepted

[sttts]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oomichi, sttts, tiloso

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