Blob refactor: Display environment button

What does this MR do and why?

Display a View on Environment button in the refactored blob viewer when an environment is available.

Note, changes in this MR are behind the :refactor_blob_viewer feature flag.

Screenshots or screen recordings

Raw SQL

SELECT
  "environments".*
FROM
  "environments"
WHERE
  "environments"."project_id" = 278964
  AND ("environments"."state" IN ('available'))
  AND (EXISTS (
      SELECT
        "deployments".*
      FROM
        "deployments"
      WHERE
        "deployments"."sha" = '504b5311c00ac2b87ba728d74925c6f46e6c5781'
        AND (environment_id = environments.id)))
ORDER BY
  (
    SELECT
      MAX("deployments"."id")
    FROM
      "deployments"
    WHERE
      "deployments"."environment_id" = "environments"."id") ASC NULLS FIRST;

How to set up and validate locally

1. Enable the Blob Viewer Refactor feature flag

Feature.enable(:refactor_blob_viewer)

2. Deploy an environment

3. Open a file in the repository file browser on the branch that has been deployed to the environment

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #350457 (closed)