Remove the Show Details button for Deployments

What does this MR do and why?

There are too many clicks between loading the environments page and viewing the details of a deployment (ref, job, etc.). We can remove a single click by removing the "Show Details" button. Environments still exist within a collapse, but everything will be shown once the environment is expanded.

Changelog: chagned

For #353631 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. add the following .gitlab-ci.yml to a project for some deployments:

stages:
    - deploy
    - stop
image: alpine:latest

deploy-prod:
    stage: deploy
    script:
        - sleep 60
        - echo "deploying prod"
    environment:
        name: production

deploy-staging:
    stage: deploy
    script:
        - echo "deploying staging"
    environment:
        name: staging
        url: https://example.com
    when: manual

deploy-review:
    stage: deploy
    script:
        - echo "Deploying review/$CI_COMMIT_REF_NAME"
    environment:
        name: review/$CI_COMMIT_REF_NAME
        auto_stop_in: 1 week
    only:
        - branches
    except:
        - main


stop_review_app:
  script: stop-review-app
  stage: stop
  environment:
    name: review/$CI_COMMIT_REF_SLUG
    action: stop
  rules:
    - if: $CI_MERGE_REQUEST_ID
      when: manual

Run a pipeline, then go to the project's Deployments > Environments page.

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