Sentry Improvements

[AlexAscherson]

What does this change?

• Added frontend release tagging support by injecting build commit id into the page in main.scala and reading it during Sentry init in sentry.js
• Added optional sourcemap upload workflow for Kahuna
• Implemented shared Scala backend Sentry coverage at the Play infrastructure layer in GridComponents.scala so unhandled server errors can be captured consistently across services using GridComponents.
• Added backend Sentry config fields in CommonConfig.scala for activation, DSN, and environment control.

Note: New env vars required for reporting - no failure if not present

For sourcemaps:
SENTRY_AUTH_TOKEN
SENTRY_ORG
SENTRY_PROJECT

SENTRY_RELEASE currently set to github.sha in ci.yml

For scala sentry coverage:

sentry.enabled
sentry.dsn
sentry.environment

are required in CommonConfig.scala / defaults in application.conf

How should a reviewer test this change?

How can success be measured?

Who should look at this?

Tested? Documented?

• locally by committer
• locally by Guardian reviewer
• on the Guardian's TEST environment
• relevant documentation added or amended (if needed)

[github-actions]

Deploy build 14780 of media-service::grid::all to TEST

All deployment options

• Deploy build 14780 of media-service::grid::all to TEST
• Deploy parts of build 14780 to TEST by previewing it first
• What's on TEST right now?

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From guardian/actions-riff-raff.