iserver-test: Fix upgrade config lazy rollover

[ericywl]

Motivation/summary

8.19 and 9.1 no longer have the same apm-data resource version after elastic/elasticsearch#130478 and elastic/elasticsearch#130477 have been merged. So, it is expected that they will have lazy rollover across upgrades.

How to test these changes

Run workflow: https://github.com/elastic/apm-server/actions/runs/16112715129.

[github-actions]

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @ericywl? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-7.17 is the label to automatically backport to the 7.17 branch.
• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• backport-9./d is the label to automatically backport to the 9./d branch. /d is the digit.
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[ericywl]

The system test failed for unrelated reasons:

=== RUN   TestApprovedMetrics
    metrics_test.go:71:   []any{
          	... // 3 identical elements
          	map[string]any{"@timestamp": []any{string("2017-05-30T18:53:41.368Z")}, "agent.activation_method": []any{string("some_activation_method")}, "agent.name": []any{string("elastic-node")}, "agent.name.text": []any{string("elastic-node")}, ...},
          	map[string]any{"@timestamp": []any{string("2017-05-30T18:53:41.369Z")}, "agent.activation_method": []any{string("some_activation_method")}, "agent.name": []any{string("elastic-node")}, "agent.name.text": []any{string("elastic-node")}, ...},
        + 	map[string]any{
        + 		"@timestamp":                 []any{string("2017-05-30T18:53:00.000Z")},
        + 		"agent.name":                 []any{string("elastic-node")},
        + 		"agent.name.text":            []any{string("elastic-node")},
        + 		"data_stream.dataset":        []any{string("apm.service_summary.1m")},
        + 		"data_stream.namespace":      []any{string("default")},
        + 		"data_stream.type":           []any{string("metrics")},
        + 		"labels.tag1":                []any{string("one")},
        + 		"metricset.interval":         []any{string("1m")},
        + 		"metricset.name":             []any{string("service_summary")},
        + 		"numeric_labels.tag2":        []any{float64(2)},
        + 		"observer.hostname":          []any{string("dynamic")},
        + 		"observer.type":              []any{string("apm-server")},
        + 		"observer.version":           []any{string("dynamic")},
        + 		"processor.event":            []any{string("metric")},
        + 		"service.language.name":      []any{string("ecmascript")},
        + 		"service.language.name.text": []any{string("ecmascript")},
        + 		...
        + 	},
          	map[string]any{"@timestamp": []any{string("2017-05-30T18:53:42.281Z")}, "agent.activation_method": []any{string("some_activation_method")}, "agent.name": []any{string("elastic-node")}, "agent.name.text": []any{string("elastic-node")}, ...},
          }
        
        Test failed. Run `make check-approvals` to verify the diff.
        
    server.go:145: log file: /home/runner/work/apm-server/apm-server/systemtest/logs/TestApprovedMetrics/apm-server
--- FAIL: TestApprovedMetrics (1.36s)