chore(ci): jsonify missing tests and move template into DIFF_COMMIT.md

[iyabchen]

For issue hashicorp/terraform-provider-google#17634
Jsonify missing tests results and move the original missing tests template into DIFF_COMMIT.md.

Triggered a missing test with the code in this PR in here: #10827

Release Note Template for Downstream PRs (will be copied)

[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.

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

@shuyama1, 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.

[github-actions]

This PR has been waiting for review for 2 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

[github-actions]

This PR has been waiting for review for 2 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

[github-actions]

This PR has been waiting for review for 2 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

[shuyama1]

Looks good! Thank you and sorry for the delay in review.

[shuyama1]

This PR has been waiting for review for 2 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

attn @melinath PR review reminder has reported for the last three consecutive days (even during weekends). Not sure if it's intended.

[melinath]

@shuyama1 thanks! It's not intended; I'm planning to look into it this week.

[iyabchen]

Hi @shuyama1 I don't have permission to merge, would be great if you can merge when possible.

[shuyama1]

Hi @shuyama1 I don't have permission to merge, would be great if you can merge when possible.

oh, sorry, I didn't realize that. I'll merge and monitor the change later today.