Backport of E2E: fix assertion in dynamic node metadata test into release/1.5.x #19122
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Backport
This PR is auto-generated from #19120 to be assessed for backporting due to the inclusion of the label backport/1.5.x.
The below text is copied from the body of the original PR.
In #18664 we change how null values worked with dynamic node metadata so that they were no longer returned if there wasn't also a static value for that key. The test assertion in E2E was not updated to match the new behavior.
Fixes: #19112
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