Add PM diagnostics to the new UKCA Diagnostics Handling system.

**This issues continues the development started in Trac/FCM** [UKCA:#216](https://code.metoffice.gov.uk/trac/ukca/ticket/216) .

This issue covers the changes required to expand the number of diagnostics covered by the new diagnostic handling mechanism added in [UKCA:#29](https://code.metoffice.gov.uk/trac/ukca/ticket/29) required by the NUAQ configuration.

Linked UM ticket: [UM:7526](https://code.metoffice.gov.uk/trac/um/ticket/7826) **TO BE MIGRATED TO GITHUB**

Latest Trac/FCM branch to be migrated to GitHub: [r7497_github_migration_nuaq_pckg](https://code.metoffice.gov.uk/trac/ukca/browser/main/branches/dev/pedromolinajimenez/r7497_github_migration_nuaq_pckg) opened from the head of the fcm/trac UKCA repository trunk at [ukca.x/trunk@7497](https://code.metoffice.gov.uk/trac/ukca/browser/main/trunk?rev=7497)

The table below list all the diagnostics migrated to the new UKCA diagnostics handling system.
| Diagname | Stashcode |
|-----------------|-----------------|
| pm10_wet | 38560 |
| pm2p5_wet | 38561 |
| pm10_dry | 38562 |
| pm2p5_dry | 38563 |
| pm10_so4 | 38564 |
| pm2p5_so4 | 38565 |
| pm10_bc | 38566 |
| pm2p5_bc | 38567 |
| pm10_oc | 38568 |
| pm2p5_oc | 38569 |
| pm10_ss | 38570 |
| pm2p5_ss | 38571 |
| pm10_du | 38572 |
| pm2p5_du | 38573 |
| pm10_nh4 | 38669 |
| pm2p5_nh4 | 38670 |
| pm10_no3 | 38671 |
| pm2p5_no3 | 38672 |
| pm10_nn | 38673 |
| pm2p5_nn | 38674 |