`dsh config available` is not showing deployed SREs

:white_check_mark: Checklist

[x] I have searched open and closed issues for duplicates.
[x] This is a problem observed when deploying a Data Safe Haven.
[x] I can reproduce this with the latest version.
[x] I have read through the documentation.
[x] This isn't an open-ended question (open a discussion if it is).

:computer: System information

Operating System: macOS
Data Safe Haven version: Data Safe Haven 5.0.1

:package: Packages

List of packages

```none Paste list of packages here ```

:no_entry_sign: Describe the problem

The SRE with ID testt2hdl is live and accessible over https://testt2hdl.prod5.turingsafehaven.ac.uk/. However, when listing deployed SREs using dsh config available we see the following:

┏━━━━━━━━━━━━┳━━━━━━━━━━┓
┃ SRE Name   ┃ Deployed ┃
┡━━━━━━━━━━━━╇━━━━━━━━━━┩
│ cgcdemosre │          │
│ edtest2p5  │          │
│ edtestp5   │          │
│ sbox123    │          │
│ testsre    │          │
│ testt2hdl  │          │
└────────────┴──────────┘

Notice no SRE is marked as deployed.

:deciduous_tree: Log messages

Relevant log messages

```none Your log details here ```

:recycle: To reproduce

Just run dsh config available from any account with production access. @dsj976 and @helendduncan were able to reproduce.

alan-turing-institute / data-safe-haven

`dsh config available` is not showing deployed SREs #2278