Use commit shas instead of branch names in diff comment

[trodge]

fixes b/384994967

Release Note Template for Downstream PRs (will be copied)

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[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.

[trodge]

@modular-magician reassign-reviewer

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run. Googlers: see go/terraform-auto-test-runs to set up automatic test runs.

@NickElliot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[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.

Errors

google provider:

• Failed to read old commit sha from file

google-beta provider:

• Failed to read old commit sha from file

[modular-magician]

Tests analytics

Total tests: 1173
Passed tests: 1089
Skipped tests: 84
Affected tests: 0

Click here to see the affected service packages

• compute

🟢 All tests passed!

View the build log

[modular-magician]

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

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 2 insertions(+))
google-beta provider: Diff ( 1 file changed, 2 insertions(+))

[modular-magician]

Tests analytics

Total tests: 1174
Passed tests: 1090
Skipped tests: 84
Affected tests: 0

Click here to see the affected service packages

• compute

🟢 All tests passed!

View the build log

[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.