Support MS SQL Server as a backend database for FlowFuse

### Epic

_No response_

### Description

**As a customer hosting FlowFuse**

**I want to use MS SQL Server**

**So that we comply with company IS/IT requirements**

### Which customers would this be available to

Everyone - CE/Starter/Team/Enterprise

### Acceptance Criteria
- [x] #3696
- [ ] #3689
- [ ] #3690
- [ ] #3691

^*1 In the discovery made during the POC carried out as part of #3689, some tables cascades need to be removed to prevent errors around self-referencing, cycles and multiple cascade paths. For this, I have added a new task that should be addressed and merged before any other. This task "targeted tests" should explicitly test the cascades and any other DB changes proposed in the branch developed for #3689. No MSSQL specific changes should be merged until these targeted tests are merged and passing for PG and SQLite.

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

### Requested by
1. https://app-eu1.hubspot.com/contacts/26586079/record/0-3/11480895182/
2. https://app-eu1.hubspot.com/contacts/26586079/record/0-3/9371478732/