Subaru: camera FW query isn't complete on startup

Brought to our attention from the FW bot, many Subarus return different results for the same ECU and request:

```python
1c451e9ed3c48243|2024-01-15--16-10-38:
[('ecu', 'fwdCamera'), ('fwVersion', b'\x00\x00e\x9a\x00\x00\x00\x00\x00\x00'), ('address', 1927), ('subAddress', 0), ('responseAddress', 1935), ('request', [b'"\xf1\x82'])
vs
1c451e9ed3c48243|2024-01-15--20-36-22:
[('ecu', 'fwdCamera'), ('fwVersion', b'\x00\x00e\x9a\x00\x1f@ 1\x00'), ('address', 1927), ('subAddress', 0), ('responseAddress', 1935), ('request', [b'"\xf1\x82']) (edited)
```

Race condition on startup?

Also looks like we've been adding them to the database:

```
(Ecu.fwdCamera, 0x787, None): [
b'\x00\x00df\x1f@ \n',
b'\x00\x00d\x95\x00\x00\x00\x00',
b'\x00\x00d\x95\x1f@ \x0f',
b'\x00\x00d\xfe\x00\x00\x00\x00',
```

Bounty
---

After 10 seconds our Outback's fwdCamera returns the full non-zero-suffixed FW. b'\x00\x00eJ\x00\x00\x00\x00\x00\x00' -> b'\x00\x00eJ\x00\x1f@ \x19\x00'. There is another FW version-related data ID (DID) on 0xf100 when using read data by ID, can we use that instead, or is it the bootloader software version or similar?

Bounty requirements:
- Our existing 0xf182 RDBI query returns the complete FW version every time, even right after startup
- OR using our [commaCarSegments](https://blog.comma.ai/096release/#commacarsegments) database, you can verify that we can use another ECU or DID. There's a EyeSight Monitor ECU that we can query that returns the physical part number and software version for example, but it's a HUD ECU.
- We can use another ECU or DID if you verify that it has enough information to identify the API of the car reliably -- if it has LKAS and ACC we can control -- and we don't fingerprint on cars without the complete API to control the car.

Start with the FW bot examples and the existing 0xf182 read-data-by-ID query, then compare the startup and delayed responses. Investigate the alternative 0xf100 DID and the EyeSight Monitor ECU against the commaCarSegments database. Done means reliably obtaining a complete firmware version or verifying an alternative ECU/DID identifies the controllable LKAS and ACC API without false fingerprints.

Written by the indexing model from the issue text.