DPL-675-2: AROUND SEPTEMBER 2023 -- Remove reports and Sentinel functionality

[sdjmchattie]

User story
As PSD, we would like to reduce technical debt and maintenance of unused components by removing the reports and Sentinel functionality.

Who are the primary contacts for this story
Adrianne L, Stuart M

Acceptance criteria
To be considered successful the solution must:

• remove the endpoints for interacting with reports.
• remove APScheduler if it appears to only be for generating reports.
• (optional) clean up old report files on the system.
• remove any endpoints used exclusively by Sentinel operations in Lighthouse UI

Dependencies
This story is blocked by the following dependencies:

• DPL-675-1: AROUND SEPTEMBER 2023 -- Remove reports and Sentinel functionality lighthouse-ui-v3#24

Additional context
Adrianne has confirmed that no-one working on Heron use the reports any more.

[TWJW-SANGER]

Now Heron has finished this is unlikely to be required.