Added flight mode GPS build flag

[RCGV1]

I have implemented a build flag for flight mode on the ATGM336H and the ublox line of gps modules. I have flown these modules before on high altitude balloons (up to 30km) and position worked perfectly, I copied the exact same flight mode code I used on these flights and added a build flag to optionally use them. I compiled and ran on a heltec v3 to ensure no obvious issues occurred but I have not actually tested if flight mode turns on (it should)

🤝 Attestations

• [ ] I have tested that my proposed changes behave as described.
• [x] I have tested that my proposed changes do not cause any obvious regressions on the following devices:
  • [x] Heltec (Lora32) V3
  • [ ] LilyGo T-Deck
  • [ ] LilyGo T-Beam
  • [ ] RAK WisBlock 4631
  • [ ] Seeed Studio T-1000E tracker card
  • [ ] Other (please specify below)

[thebentern]

Looks good, but there is a protobufs ref change that tagged along as well.

[RCGV1]

@thebentern can we open this again

[RCGV1]

@fifieldt

[fifieldt]

Needs: https://github.com/meshtastic/protobufs/pull/749