Refactor admin applications to use doorkeeper HAML partials

📖 What does this MR do?

Preparation for #332844 (closed)

Refactors Admin area -> Applications -> View an application to use the shared shared/doorkeeper/applications/show HAML partial. This will prepare us for #332844 (closed) so we can make the same change to Admin area applications, Group applications, and User applications in one shared HAML partial.

💻 Local testing

1. Navigate to Menu -> Admin -> Applications
2. Click New application and complete the form
3. Screen should be unchanged as this is just a refactor

📷 Screenshots

Before and After expected to be the same

View	Before	After
Admin applications
Group applications
User applications

🚦 Does this MR meet the acceptance criteria?

Conformity

• [-] I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
  • Not needed, developer facing change
• [-] I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• [-] I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• [-] I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• [-] I have tested this MR in all supported browsers, or it's not needed.
• [-] I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.