[PAGOPA-2086] feat: add endpoint for expose static error page

[andrea-deri]

This PR contains a new endpoint that permits to expose static HTML resources in order to be used from APIM policy.

List of Changes

• Add new endpoint for the exposition of error landing static page

Motivation and Context

This feature is required in order to use the static pages in other contexts without duplicating the HTML code

How Has This Been Tested?

• Tested in local environment

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[github-actions]

The default action is to increase the PATCH number of SEMVER. Set IGNORE-FOR-RELEASE if you want to skip SEMVER bump. BREAKING-CHANGE and NEW-RELEASE must be run from GH Actions section manually.

[github-actions]

The default action is to increase the PATCH number of SEMVER. Set IGNORE-FOR-RELEASE if you want to skip SEMVER bump. BREAKING-CHANGE and NEW-RELEASE must be run from GH Actions section manually.

[cap-ang]

See the comments, the core update LGTM 👍

[github-actions]

Comment this PR with update_code to format the code. Consider to use pre-commit to format the code.

[sonarcloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud