Backport of test: Fix bug in TestAddTestPlugin test helper into release/1.13.x #19317
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Backport
This PR is auto-generated from #19313 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
This PR fixes a bug in TestAddTestPlugin that appears to only manifest on Linux systems. This bug resulted in the test failing on Mac systems but passing on Linux systems because we failed to properly get the plugin version.
Additionally, we update the test to use the plugin version when performing the Read on the plugin catalog since this should now be properly set.
We write the plugin binary file in TestAddTestPlugin and then call file.Close() in a defer statement. However, we need to read the file's SHA256 sum immediately after writing the file so we call file.Sync(). On Linux this was not working as expected because we seem to be reading the sha sum and running the plugin too fast. This caused the call to get the plugin version to fail and to be incorrectly written to storage as un-versioned.
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