[CI change] Make downstream-waiter compatible with commit merges in main

[shuyama1]

Release Note Template for Downstream PRs (will be copied)

[rileykarson]

Seems reasonable- we're updating main to use the 5.0.0 behaviour

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[modular-magician]

Tests analytics

Total tests: 3089
Passed tests 2788
Skipped tests: 299
Affected tests: 2

Action taken

Found 2 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccHealthcareDatasetIamPolicy|TestAccSpannerDatabaseIamPolicy

Get to know how VCR tests work

[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccHealthcareDatasetIamPolicy[Debug log]
TestAccSpannerDatabaseIamPolicy[Debug log]

Rerun these tests in REPLAYING mode to catch issues

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

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$\textcolor{green}{\textsf{All tests passed!}}$
View the build log or the debug log for each test