LASB-3637 - implement sentry DSN value as secret

[lkm0287]

What

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Checklist

Before you ask people to review this PR:

• Tests should be passing: ./gradlew test
• Github should not be reporting conflicts; you should have recently run git rebase main.
• Avoid mixing whitespace changes with code changes in the same commit. These make diffs harder to read and conflicts more likely.
• You should have looked at the diff against main and ensured that nothing unexpected is included in your changes.
• You should have checked that the commit messages say why the change was made.

Additional checks

• Don’t forget to run the MAAT functional test suite after deploying your changes to the DEV or TEST environments to ensure your changes haven’t broken any of the functional tests.

[Ross-Nation]

Vamos!