feat: DBC / LocalOffice Programme owner refactor

[ReubenRobertsHEE]

For context see (now removed) comment:

    //NOTE: refactor this as per: https://hee-tis.atlassian.net/browse/TIS21-6228
    //As a Designated body name will no longer be equal to a Local Office name, and the programme
    //owner is a Local Office name, the 'findByOwner()' below will become invalid.
    //This may require
    // (1) sync LocalOffice into sync db as well as reference.
    // (2) ensure abbr field is included (its missing from the Reference LocalOffice collection)
    // (3) join dbc.abbr <-> LocalOffice.abbreviation and use LocalOffice.name <-> Programme.owner

Dependent on
Health-Education-England/TIS-REFERENCE#343 and Health-Education-England/TIS-SYNC#253

TIS21-6273

[sonarqubecloud]

Quality Gate passed

Issues
0 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

[ReubenRobertsHEE]

'value' can be either a dbc or an abbr. These should never overlap (share the same value), so there should never be key collisions - but if desired we could either prefix them with the type of key (to ensure uniqueness) or have two separate caches.

[DorisWongNHS]

LGTM