Add a dashboard of build/test status to the nightly build page.

[jonsimantov]

Description

Provide details of the change, and generalize the change in the PR title above.

This contains two parts: a script that fetches and analyzes GitHub nightly run results to see if they passed, and if not, what failed. And a script that posts that into the nightly build summary (along with the workflow to run it each morning).

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Testing

Describe how you've tested these changes. Link any manually triggered Integration tests or CPP binary SDK Packaging Github Action workflows, if applicable.

Tested via manual run: https://github.com/firebase/firebase-cpp-sdk/actions/workflows/build-report.yml
Which updated the nightly report: #1179

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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Notes

• Bug fixes and feature changes require an update to the Release Notes section of release_build_files/readme.md.
• Read the contribution guidelines CONTRIBUTING.md.
• Changes to the public API require an internal API review. If you'd like to help us make Firebase APIs better, please propose your change in a feature request so that we can discuss it together.