feat: create stub app for admin frontend

[banders]

Description

Copied the 'frontend' folder to 'admin-frontend' as a starting point for the upcoming admin application. Made changes to the Github workflows, Helm charts and environment vars specific to the admin app. Updated the backend with a new express "app" to handle IDIR login for the admin application.

Some of the source code and components copied from the frontend probably won't be needed in the admin application, and can be deleted or modified in a future PR.

Fixes # GEO-637

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Most of the unit tests from the frontend have been copied into the 'admin-frontend' app.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

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Thanks for the PR!

Deployments, as required, will be available below:

• Frontend

Please create PRs in draft mode. Mark as ready to enable:

• Analysis Workflow

After merge, new images are deployed in:

• Merge Workflow

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Thanks for the PR!

Deployments, as required, will be available below:

• Frontend
• Admin Frontend

Please create PRs in draft mode. Mark as ready to enable:

• Analysis Workflow

After merge, new images are deployed in:

• Merge Workflow

[sonarcloud]

Quality Gate passed for 'Pay Transparency backend-external'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[sonarcloud]

Quality Gate passed for 'Pay Transparency Frontend'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[sonarcloud]

Quality Gate failed for 'Pay Transparency Backend'

Failed conditions
6.6% Coverage on New Code (required ≥ 80%)
42.5% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[sonarcloud]

Quality Gate passed for 'Pay Transparency doc-gen-service'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud