Don't cache openapi schema when debug/insecure mode is enabled

[prryplatypus]

NetBox version

v4.1.4

Feature type

Change to existing functionality

Triage priority

N/A

Proposed functionality

When debug mode or Django --insecure mode is enabled, the OpenAPI schema shouldn't be cached (or the cache should be busted upon reload/restart).

Use case

When developing plugins, it is common that the schema is changed. Having to bust this cache manually every time a change is made in development is additional unnecessary work the the developer, which hinders DX and in cases confuses the developer wondering why changes aren't showing.

Database changes

No response

External dependencies

No response

[prryplatypus]

Will not be needed when #18021 is fixed